Malicious PDF — malware analysis report

Static analysis result for SHA-256 da03885f311b951f…

MALICIOUS

PDF

80.1 KB Created: 2021-02-20 08:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 12458091f76e11323f46b075e7b01ef3 SHA-1: e8c07819e5ee43e2bb021b86e87a61ec7fa8b61d SHA-256: da03885f311b951f50d10bb9c591c6db84405ce03a99946f659708c19ca3c2bf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs 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://bologen.ru/wix?keyword=working+model+definition PDF link annotation
    • https://cdn.sqhk.co/xogodapap/VdtSjcl/communication_and_interpersonal_skills_in_social_work_koprowska.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fd8d12820ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_603068a02b6d5.pdfIn PDF document text
    • http://hookup666.site/gasolagazamogubatunuwik745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff192586745d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fcf0bc383a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_601f11584df6c.pdfIn PDF document text
    • http://easterthjg.com/go_to_market_strategy_template_freevmozp.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/ghgjiup/scary_teacher_mod_apk_low_mb.pdfIn PDF document text
    • http://doucheapp.xyz/3617837194559lvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_601b1d272842f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5ffa88bcd9d11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413968/normal_5ffcd0369dc5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_6005f6987e6f3.pdfIn PDF document text
    • http://xoxunanodu.22web.org/skype_phin_bn_mi_nht_2017.pdfIn PDF document text
    • http://bilkaita.space/happy_jinlian-_pan_2015lqsrr.pdfIn PDF document text
    • http://febefapowe.22web.org/arabya_rajani_bangla_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigisewolax.epizy.com/android_9_split_screen_shortcut.pdfIn PDF document text
    • http://dojomasamolazib.epizy.com/aviva_home_insurance_claim_form.pdfIn PDF document text
    • http://salivokeru.epizy.com/ayushman_bharat_free.pdfIn PDF document text
    • http://bajefeluxit.rf.gd/zolpidem_10mg_bula.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 4916 bytes
SHA-256: 901b2f2fa87a2a2165a0be8e3db0cdfac83f868920b6302bdd48a64c444b5def
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10380 bytes
SHA-256: e56fe1b0b882bb8475c7ba072656ee00d6338c1d27ff58408c65121b6a175116

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