Malicious PDF — malware analysis report

Static analysis result for SHA-256 77373a34ac7b78b8…

MALICIOUS

PDF

81.7 KB Created: 2021-03-29 04:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b12ebbf4f0e4eeee91fda451c7394419 SHA-1: 27b93e9e0bcf47000707aa13b6c823353adf8655 SHA-256: 77373a34ac7b78b8dbfdf4b33b237b0db4b59fcfdaac3c89f014bd5bbce87ee9
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a user guide, which is a common lure for phishing or malware delivery. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://jumiwimov.ru/123?utm_term=aeon+timeline+user+guide
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/33dccdf5a7c.pdf
    • https://deluwibenarut.weebly.com/uploads/1/3/1/3/131382693/17ccdaef8875.pdf
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/tamafiluxewoge.pdf
    • http://bikelumonekodex.mygamesonline.org/solid_wood_school_desk.pdf
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/7323020.pdf
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/kiridazuneduba_xolajiposaj_vurewop_volumu.pdf
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/9515781.pdf
    • https://ferowadamo.weebly.com/uploads/1/3/4/5/134593689/6604580.pdf
    • https://gejeliruvuke.weebly.com/uploads/1/3/4/6/134699680/3221898.pdf
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/kolubebugixodo-xunak-tawusadugetu-jifobigiwu.pdf
    • http://lolkek.xyz/zizufavixatocui9t.pdf
    • http://picsonair.com/jakizejavaxosilexozuwakomgwxl2.pdf
    • http://bcpzonasegur4viabcp.com/gopro_hero_4_black_specs1fjt8.pdf
    • http://funasowuto.getenjoyment.net/50694310294.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejakixoweka/13799735800.pdf
    • http://rixigor.onlinewebshop.net/55382502271.pdf
    • https://uploads.strikinglycdn.com/files/6914fc76-5477-474f-94c2-7c1fb011a939/lewulisitofariledupifar.pdf
    • https://s3.amazonaws.com/vajefam/46564714318.pdf
    • https://s3.amazonaws.com/fajonubinomeder/86967920440.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/cambridge_guided_bus_timetable_trumpington.pdf
    • https://s3.amazonaws.com/fosawef/sharp_aquos_70_smart_tv_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010498.bin
20508a04bcd3b334367c2a37a6abca43e4051fab9b2f84b2f2c434b8c564cea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 4924 bytes
font_01_sfnt_off00011542.bin
ceec6076c97d4e91fe1d277888796fdc17c4c0f37819d0f97b88b318171327ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 10552 bytes

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