Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ec547c5862982f…

MALICIOUS

PDF

87.2 KB Created: 2021-01-26 19:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a325d2802adfad61fc16c4e19ef85a6e SHA-1: 70f4150a550f45aa59fb393c394af2c9ae791621 SHA-256: 85ec547c5862982f12415fc197de78b727c2d2612f16fc26b0249af95ff6f524
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jacksth.ru/123?utm_term=computational+materials+science+salary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393485/normal_6002c5dd893fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449172/normal_6004f065c070a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fd253fd6f259.pdfIn PDF document text
    • http://manaluw.iblogger.org/necromancer_template_dnd_5e.pdfIn PDF document text
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/5d9b08.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/7457748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_600a8b08da105.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/pizarakisu-rewawuregirex.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/06e0235b12c.pdfIn PDF document text
    • http://virenoveza.22web.org/tirusubosidiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_5fdb2d2808e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_5fdb174c0e7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fe7a15b91783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusori/printable_calligraphy_practice_sheets_free.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/calls_blacklist_call_blocker.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/78195162915.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/gym_bodybuilder_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/91225141164.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/60840796464.pdfIn PDF document text
    • http://vokutenux.epizy.com/bebasi_dard_ka_aalam_song_free.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_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 2952 bytes
SHA-256: 6f6c5a8fb5e62cfd2b6ff76f758e0f05a98695d5bac735cd019a42cb5e5649ba
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 5084 bytes
SHA-256: bf170888388a42e147c367bf8f55b76e8341816a3f4ce238751b055ff8d0343c
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 12064 bytes
SHA-256: b2a05be5715ddc9711b0719a369b8c9f41e995fa9a17e44c7a9a354540f2cfa5

Open this report in the interactive analyzer, or submit your own file for analysis.