Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce98af987eb3277c…

MALICIOUS

PDF

83.0 KB Created: 2021-03-30 21:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 281ffe6943714d2ac384b65d10d4c288 SHA-1: 76754c3616c2a373ce8e9207b315cf26f213b9b2 SHA-256: ce98af987eb3277caec76a4b2436149055cc665ec869924328ff16b0e1f43301
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=barracuda+spam+firewall+virtual+appliance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466675/normal_60595d4ac6c6c.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/thermo_king_apu_codes.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/zopomefejalit.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/6QRjdPJ/attack_on_titan_eren_death_scene.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/aiigfhc/zemova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_6005bfb479ee7.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/rbUhiII/snake_and_ladder_game_free_printable.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/zudowuvomuwadimukafuleroj.pdfIn PDF document text
    • https://cdn.sqhk.co/puviponapib/bjfZlhb/priority_mail_insurance_claim_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_6019b3a153fd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fe0bd75e9c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_602f6ed61a947.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/1jc14OW/ninja_foodi_recipes_chicken.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/both_ways_is_the_only_way_i_want_it.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/bunting_template_a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_603d316b9e3dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_605c96dc2f274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_604491b56a278.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://s3.amazonaws.com/jitimesolagun/sumudofukakudosibefi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/african_american_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a12fd8-abc1-4221-9889-e7cb7c79c1b5/zufilezifepigaxoju.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/81443923417.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/tafuzasupititofev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd34e194-0ada-45e9-be2c-44463c352f0c/dunkin_donuts_price_list_philippines_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5dea50-e261-4155-babb-39a177185b00/1342145216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5729fa-415e-4fbc-8dbf-943d15eacca5/22947231747.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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 5272 bytes
SHA-256: 0014834b101105238279d2f943d17aed01aee010501f11907bd3f4ffbccbdb89
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 10456 bytes
SHA-256: e7e5bc25352db204f79acf4abad7a7cf0fefa654d4586e54d994dd22127b0f4d
font_02_sfnt_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176