Malicious PDF — malware analysis report

Static analysis result for SHA-256 5437e73a7af4d4ac…

MALICIOUS

PDF

88.5 KB Created: 2021-02-23 19:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc4e44e61f7942c133988900dbbd8b83 SHA-1: b192f8380e3b2c631fc8021d994ba1cb93c4231b SHA-256: 5437e73a7af4d4acb2f0f396b72a988a5385230e4beece2dff86b588f7680830
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=what+is+conflict+management+definition+styles+%2526+strategies In PDF document text
    • https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/0ded856b77be9f.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/gjLge1t/zetututonujabutopenubug.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/b3Vidgd/57012293686.pdfIn PDF document text
    • http://xumukekuvag.22web.org/broan_nutone_s0504b000_bathroom_fan_motor_assembly.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/gimenaxoba.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/xuxotujokenunap_pavejug_mexuvila.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/S5Djggd/bapupupemovitiwejakize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fe542cc0a630.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/en5thhZ/79050367100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_600c71ccca554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokozagizek.rf.gd/complete_sentences_worksheets_5th_grade.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/franchise_operations_manual_sample.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_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 5456 bytes
SHA-256: b1fb4f96def07ae4b798b16cf18ff1ccb9aa88428b170ded9eef700df0dc04d3
font_01_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 11252 bytes
SHA-256: 46ac22988e056e361b74635c429d6ca27ce255bc7ba247548cabaf7acb8b7333

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