Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac6ece31452f0eb…

MALICIOUS

PDF

82.1 KB Created: 2021-02-19 23:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 939088623294c32b575278d65533c27e SHA-1: 6f3c36aabc78543bf08e6074672732cabe47b7e1 SHA-256: 1ac6ece31452f0eb5ca776a10363d2c7cd984bba2c1dcd93bd197f36bf47c1cb
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The document body is heavily obfuscated and contains what appears to be junk data, but the presence of external links and the overall heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=what+is+an+er+doctors+schedule PDF link annotation
    • https://cdn.sqhk.co/jomutepe/hklNX5W/spacex_launch_live_fox_news.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/ji2DxyE/loner_synonym_formal.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/3414996.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/jjhiZgh/gadulenixidivowenovekefaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_60116d7190bc7.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/devoxometi_fiwofebe_nizomineginofo_kovanidil.pdfIn PDF document text
    • http://fullpisetc.ru/zafapifovimuwyohoq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_601446b9a2b02.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/5417230.pdfIn PDF document text
    • https://zasufademebarav.weebly.com/uploads/1/3/4/7/134737005/33db9737e.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/e5jgibM/name_the_celebrity_safe_house.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495536/normal_5fdb1c971a382.pdfIn PDF document text
    • http://bottlechainworld.com/canape_abatible_yecoly0m4p.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/gO1kVRe/stellars_quest_2d_shooter_platformers.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/cgiigfs/zaligijoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 5040 bytes
SHA-256: 126c0a830eefb4b60c13b6fa8fdc1cf02890d50dcaef6262c093fb46c3e07b37
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 11484 bytes
SHA-256: f362b2762cf379ef9005a4caba714481d268a99971ed1f470f4a6c3c6cb5dba0

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