Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e9dd7f92f5a977…

MALICIOUS

PDF

77.7 KB Created: 2021-03-08 08:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f9e9fe10e4bb70d2206048acc24967f SHA-1: 46b50f8e0ba63df5b85be550e29180a7109f1045 SHA-256: 35e9dd7f92f5a977534bd6532632ca382195b03fc5023281ec939c4f7113982f
244 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites, including a known malicious redirector at 'yafferge.ru'. The document's structure and embedded links suggest an attempt to manipulate search engine results or distribute phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=mini+harley+davidson+parts In PDF document text
    • https://cdn.sqhk.co/luzigagoguna/2ghidoH/does_not_commute_story.pdfIn PDF document text
    • http://logoped-samara.ru/27857133319nrjfg.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/14596190490.pdfIn PDF document text
    • http://makamar.xyz/bixufojopabohkv0.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/how_to_cook_chicken_tenders_in_a_farberware_air_fryer.pdfIn PDF document text
    • http://pasetbs.xyz/refidasetevib87371.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/QhfX1V7/38712043898.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/can_i_renew_my_drivers_license_online_if_its_expired.pdfIn PDF document text
    • https://cdn.sqhk.co/mipemoku/mhfidgf/top_level_up_games_for_pc.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://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_4624fb09d4bc464f9be7a78df39f8ba8.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/lion_king_food_chain_worksheet_answer_key.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_485f3494666a4e79aee26299b2d10ee6.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_7423ba57763d4f24bf54397fc45f1996.pdf?index=trueIn PDF document text
    • http://xipanizi.myartsonline.com/can_i_use_amazon_echo_as_a_bluetooth_speaker_without_wifi.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_76068ae970e4481482ae9dfbcd141e61.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_e82081ea99aa42c395cd9f2d2b5c476c.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/from_the_mixed_up_files_of_mrs_basil_e_frankweiler_quotes.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_8edb522a872643dd9ee4dabfa6e6e8e1.pdf?index=trueIn PDF document text
    • http://rodexiguv.onlinewebshop.net/how_to_reset_haier_refrigerator.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_200756f14cae425cace17d3500d5738a.pdf?index=trueIn 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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5000 bytes
SHA-256: f5a46592d90af4840ef510774dcb90e1b587d366ebb9c2ca7e59bd8638aebe4d
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 10868 bytes
SHA-256: 5f1faf2d89942e51cfa494d679c2acc65a1cd875e5ce91757974ccea3d6f1952
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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