Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd432b2c902716e1…

MALICIOUS

PDF

79.0 KB Created: 2021-02-21 11:38:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15bde70b6da949568d165b2fc23a6c89 SHA-1: f12944d39937bae1b089459dac34e3468a747a82 SHA-256: fd432b2c902716e166faf7c41a5e22940cf8ca380199166bd814114ca94d2c0e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to other PDF files hosted on various platforms, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the extensive linking suggests an attempt to drive traffic to potentially malicious or low-reputation sites, possibly as part of a phishing or spam campaign.

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 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.
  • 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/aws?utm_term=fender+hot+rod+deluxe+tweed+review In PDF document text
    • https://joziwofu.weebly.com/uploads/1/3/4/0/134012586/gukalukovap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5fed698c1dd81.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/WTjgKhe/shooter_jennings_4th_of_july_lyrics.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/second_conditional_clause_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_60011ff19c6c6.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/kokopizidadadud_vupaxezosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407810/normal_5ffb54f95c903.pdfIn PDF document text
    • http://fagemolorano.iblogger.org/48787509570.pdfIn PDF document text
    • http://xokesate.22web.org/62964199151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fc5b9c9998b8.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/gawawutijedevutulaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumidukegex.rf.gd/pocket_juice_hybrid_heat_portable_charger_and_hand_warmer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/chicken_biryani_hd_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/algebra_1_graphing_linear_equations_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/ac_dc_hells_bells_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/pijosutafuwemesera.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/22440713129.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/9726813230.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/66529896752.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_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 4700 bytes
SHA-256: 542550dd510f1f785b80d2275c35334b2165f061fa3dc5bf6a585d1c2e43fa90
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 10964 bytes
SHA-256: ed7e9b51b6e021d26862aaf868e89d2de619956faff9cac54f187ba329fddce2

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