Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66504d6bad6ddad…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 10:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 69ee0a48a809aab4242c5b3bd7c6c9dd SHA-1: a09c25e6a4cedcb93fc41c4cd8f6b45082a25361 SHA-256: a66504d6bad6ddade754bb746ed741aa022592255910fa88b1041e2ed67c6e1c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=how+to+fix+my+maytag+refrigerator+ice+maker PDF link annotation
    • https://cdn.sqhk.co/nizufalagef/jjOiigk/escape_girl_room_level_4.pdfIn PDF document text
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/4733759f.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/egiihhh/crushed_ice_paint_colour.pdfIn PDF document text
    • http://remidisafenepi.22web.org/whos_the_strongest_person_in_one_punch_man.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/igicjbT/fish_aquarium_decoration_kits.pdfIn PDF document text
    • https://cdn.sqhk.co/kokijunuxagi/gYBghtW/box_games_zombies_2_players.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/igwntJe/73186494597.pdfIn PDF document text
    • https://cdn.sqhk.co/wabogoga/hgkD9gd/10152862535.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/ypjfDAb/fireboy_and_watergirl_ice_temple_walkthrough_level_8.pdfIn PDF document text
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/xasibemexonu.pdfIn PDF document text
    • http://kuvusobapi.iblogger.org/31248217888.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/idghgd7/mcat_test_questions_and_answers.pdfIn PDF document text
    • http://jazajozem.iblogger.org/7438432069.pdfIn PDF document text
    • https://fuwurukuzubefek.weebly.com/uploads/1/3/0/9/130969433/fewobirejevug.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/0gcMibx/kpop_entertainment_ranking_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/HcjaPFe/duterte_fighting_crime_2_apk_unlimited_money.pdfIn PDF document text
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/nifen-rekak-vujip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_09db7f3e531f4e29823767f992325cd5.pdf?index=trueIn PDF document text
    • http://tapejufujol.epizy.com/gudonobisirapal.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_f61ef8c6d0d8494ea74867d74d286630.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_405fb9d456904dd5b1a0924c35d29c1c.pdf?index=trueIn PDF document text
    • http://gumijodopivu.rf.gd/medicine_journal_case_report.pdfIn PDF document text
    • http://viwaneb.rf.gd/artritis_reumatoide_guia_rapida.pdfIn PDF document text
    • http://gatanugirax.rf.gd/3822361540.pdfIn PDF document text
    • http://fafamofuwinofen.epizy.com/sony_xplod_car_stereo_price_list.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_605ef3f1a6884deb85a6aa37c4361217.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_3d1b6451085c449ba68ca00f726e9aad.pdf?index=trueIn PDF document text
    • http://dajejat.rf.gd/marigogetuvemozope.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 4960 bytes
SHA-256: 9df8cfeb268455a113ab2303cdb678e8527bb2ac38b0be0de26fee0159cf4b10
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10300 bytes
SHA-256: 355eb65e03c791fdce6e326622ac1882bb165b9fc597a50e21fdeedcf9afb707
font_02_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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