Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8385770fcd86db…

MALICIOUS

PDF

71.6 KB Created: 2020-11-13 05:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ad193a66c9a2f8cf6faf97313ea70763 SHA-1: 9f81e90ccd3487f04e226cd9e147a3596a4bf9ab SHA-256: 3c8385770fcd86db347bccdc9b34354b210edb75f7518a41f2c71b614fa0923e
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 of which point to redirectors or SEO farms, indicating a phishing or malicious content distribution scheme. The presence of a ML classifier flagging it as malicious and ClamAV detection further supports its malicious nature. The document body, though heavily obfuscated, contains text related to 'College admission form 2019 kolkata', aligning with the 'free-download phishing' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?utm_term=college+admission+form+2019+kolkata PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f8f45aba60e4.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/nibakegabagexa.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/1719ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f915b5b8c27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fadc7f51a0a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fad29f20bddd.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/7f15f8c6-f1d0-4ae7-97c2-36ba6b3f49bc/22114250360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a07037-94a2-44a2-9ed7-8bc040c7a4c0/bobuzazepufane.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/94451952274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f069e7ee-fc9a-41a7-ae08-8821ab3ed5b5/mulaxelurofe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 5584 bytes
SHA-256: 0d5342a773a7a09cb98e7de5cce112231c976619ae667b7ec7e7669b0cd244a7
font_01_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 11224 bytes
SHA-256: 39b94a33f42c8d0b064db66ed5258109558cc8be30c9984cf2429c14e0759e0e
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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