Malicious PDF — malware analysis report

Static analysis result for SHA-256 8704e7378e4c9e5f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 03:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d36cd10a85b9883c104af0f0a4a5d498 SHA-1: 5ce2e6ffd0c2b6d6c8ca62bd382e8db9093d4451 SHA-256: 8704e7378e4c9e5f61e1c76f125354b8d7a0e5b94fad893206413b798c0402c8
186 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a PDF phishing trojan. It contains a large number of external links, many pointing to disposable hosting or redirectors, characteristic of a link farm used to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=which+brand+is+the+best+air+fryer+oven PDF link annotation
    • https://cdn.sqhk.co/nulusezitelo/pijVgic/wink_news_anchor_team.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_604a406f7b734.pdfIn PDF document text
    • https://josusijino.weebly.com/uploads/1/3/0/7/130739082/fonuxetazewep.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/GsPiciQ/troll_face_quest_silly_test_level_23.pdfIn PDF document text
    • https://cdn.sqhk.co/vavapezami/fgiZ1jg/antivirus_cleaner_app_free.pdfIn PDF document text
    • http://konanozopesan.22web.org/pikexo.pdfIn PDF document text
    • http://bojelopiroxi.22web.org/amplitude_modulation_equation.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/d0jbihe/how_to_draw_a_small_ice_cream_truck.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/gevolabesovisalifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_601e1bcf91e43.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/3147656.pdfIn PDF document text
    • http://kulokozataxat.22web.org/27845044252.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
    • http://wezikadedikenev.epizy.com/troy_bilt_lawn_mower_dealers_near_me.pdfIn PDF document text
    • http://telenusu.epizy.com/mutonodipapumi.pdfIn PDF document text
    • http://vanudedu.epizy.com/epf_caruman_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e40dd8f-61b9-43b9-ac31-28688316d228/41151268570.pdfIn PDF document text
    • http://fipaliwabalutu.rf.gd/wikiseduduzonikunodesewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bc5665-2fd8-41e5-b17b-30e6b9b8c910/o_que_so_ttulos_de_crdito.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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 5180 bytes
SHA-256: 20a0757ac28d1a787ff96cac0f7e4a6b9c72fd189607df2bae329fcbf7b875bd
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10984 bytes
SHA-256: 2333d193b695ab560be0956aa0315adf363ec697e5ac3600132e0e28c21e00bd
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361