Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c69f09614e61c…

MALICIOUS

PDF

68.8 KB Created: 2021-02-23 21:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 2627ae51593836a2cc03cd61aa47e27d SHA-1: 1288f65669a16a4dbc9f015a80461fb25f865b4a SHA-256: f37c69f09614e61cd13ac28297b2bc1b8f571a110f9273decafb59b08847d800
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to educational material ('factoring using synthetic division worksheet pdf'). The presence of multiple links on disposable hosting further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=factoring+using+synthetic+division+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6019d949b21e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_60126a0755924.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/j1ijuhj/zolulanabogeruxerinajoke.pdfIn PDF document text
    • http://jotositafi.22web.org/hitachi_fridge_review_singapore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_6019dbf4d82c5.pdfIn PDF document text
    • http://banepudota.iblogger.org/treatment_guidelines_for_secondary_hyperparathyroidism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60206db8cc4dd.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/hhgfojc/wewuvodolobitazomizenilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5fda31c1d679e.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/m0kidih/vepeparenonalox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxepivebafugig.epizy.com/generic_structure_descriptive_text.pdfIn PDF document text
    • http://sozidaxaguzir.rf.gd/batman_unlimited_animal_instincts.pdfIn PDF document text
    • http://nifanokobo.epizy.com/45770459989.pdfIn PDF document text
    • http://xomexopiguv.rf.gd/86036702303.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/book_of_mormon.pdfIn PDF document text
    • http://zotuzibufuvonif.rf.gd/bi-_weekly_budget_template.pdfIn PDF document text
    • http://wuvuwipiwizovid.epizy.com/63931799880.pdfIn PDF document text
    • http://nosorozu.epizy.com/50084270449.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_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 5656 bytes
SHA-256: d36a252cead47b719dbab405b165f99c38cf04bdfc310b4015ca303d472a04cb
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 10504 bytes
SHA-256: 8706a9e47b4fb5387ac64b0f1912dcc3887c8c3895d016eabbbb1c384e0906b3

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