Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3b06ce880996df…

MALICIOUS

PDF

72.0 KB Created: 2020-12-23 02:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3bdde5752866368fb291c836f51e1894 SHA-1: 3f558b4ab48246e5efd0ca4d016c14abb45d489a SHA-256: 5a3b06ce880996df088f75c8098923defa92ce29d8f6961bf518081271021a5c
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to redirectors and SEO farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this. The embedded URL 'https://trafffe.ru/strik?utm_term=network+marketing+quotes+in+tamil' is a primary indicator of the malicious redirection. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lead the user to a malicious site.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffe.ru/strik?utm_term=network+marketing+quotes+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5f9785bf11c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5faf97eec3256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f8b60dcb6412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_5fdbc22f8bcab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fb2c9403aec3.pdfIn PDF document text
    • https://kotidirexi.weebly.com/uploads/1/3/4/3/134358756/legidobisaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_5fac3a616f99b.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/79a404c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fe139752768df1fe572abc3/t/5fe270f8a989130e60b392fb/1608675577060/51349639376.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29575be9b693951158987/t/5fd00d3a055cc35c686f8a4b/1607470395238/aliens_vs_pinball_android_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb4e565-2e1d-4e32-83b3-714d4590f2df/7245641840.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe2417e7202640eab110/t/5fc59f88f8cdb769c6a53f36/1606786952320/types_of_unions_economics.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 5256 bytes
SHA-256: e45be32daf50593ff872b705019e7119e58133eefaf883e84e524ba68c2e238b
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10364 bytes
SHA-256: deb7c41f1f2f0825d956ed8be4932f7193254fc48e225ff3d85142ae4833765b

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