Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37d5398777e77d1…

MALICIOUS

PDF

71.2 KB Created: 2020-11-10 20:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b942dc3c00919820fec2b51f3a4afc87 SHA-1: 23ec4e1a0d729dad94c98d7888a7a822af30e6a1 SHA-256: c37d5398777e77d1f6edd5f80e5609a21cbc73ee01759f2d80fbee33bec53249
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://traffnew.ru/123?keyword=major+world+events+in+2013 PDF link annotation
    • https://dedofuzogod.weebly.com/uploads/1/3/4/3/134374436/816017.pdfIn PDF document text
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/boremo-wusesedot-dodirufatu.pdfIn PDF document text
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/1326603.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/921f2a38670194.pdfIn PDF document text
    • https://sinixamaruxibul.weebly.com/uploads/1/3/4/6/134653816/finileluvapug.pdfIn PDF document text
    • https://fulugive.weebly.com/uploads/1/3/0/8/130874350/ruvigilagukid.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/1887573.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/zamovena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5fa173a860438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/385f9dd9-8d8d-41a8-8147-7c411c36c5c9/2401609927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52205b4c-9811-4315-995b-75a29a7b9dff/difference_between_hardware_and_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4604e90-69c9-4bd7-9416-9bf98dc6fbb3/golf_cart_rental_cleveland_ohio.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_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 5332 bytes
SHA-256: a29503efa5fbfa825f0091a2bbd263b5b3148f8d38ddaa009e0e94319d6ff10b
font_01_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 10452 bytes
SHA-256: ca4e6ab597bbecefd50e602144ac5df7dead8b5a413cfb19a90a39cfaae2e972
font_02_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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