Malicious PDF — malware analysis report

Static analysis result for SHA-256 9125cb0ba25a3801…

MALICIOUS

PDF

77.1 KB Created: 2021-03-01 04:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22dd1510a1fad8956ced50ea5ac220f5 SHA-1: d8effcb9d0589bc6f49b06d733fcad9e939ecf7b SHA-256: 9125cb0ba25a38016af9e8e62d13598a153680861d7d8400b5b43fc2c88636c4
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 0.9998

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://leonvi.ru/wix?keyword=ap+calculus+bc+infinite+series+test PDF link annotation
    • http://nesorus.mywebcommunity.org/panasonic_viera_tv_remote_volume_not_working.pdfIn PDF document text
    • http://wacc-cat.org/us_polo_assn_watch_manuali2gb3.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/J5hhhfo/vuwixeroxefovidu.pdfIn PDF document text
    • http://goodnatural.space/over_the_rainbow_lyrics_full3ciyh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fc930d635319.pdfIn PDF document text
    • http://govnososal.xyz/ear_infection_in_dogs_causing_paralysis9pisl.pdfIn PDF document text
    • http://olipaka.xyz/mikrotik_sxt_lite5_default_ipittvr.pdfIn PDF document text
    • http://reduslimitalia-official.site/zayn_malik_book_online_readinggamp4.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/jiagcig/ocotillo_cactus_images.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/does_bodyboss_really_work.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5feb46fc9484a.pdfIn PDF document text
    • http://smallita.space/riddles_with_answers_funnygtnug.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/H5Ecgdz/29945715721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fca6dba845e1.pdfIn PDF document text
    • http://letgtma.bid/dietary_guidelines_for_lipids420qu.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://vujapoguxesak.myartsonline.com/2003_ford_focus_zx3_tire_size.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_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 4912 bytes
SHA-256: fdb73327ccce4f97f81b5d9e0d4aa8ee35c87a199e4dac5a27d282915e058b81
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10156 bytes
SHA-256: c29ff93133f61f6643669772f467903d0f08ae76d0dfe10fca33300ce0a3684d
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176