Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b1a5a4911a4c86…

MALICIOUS

PDF

68.3 KB Created: 2020-12-05 12:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e51c8321e51f73b6cdc5139295ee09f4 SHA-1: 1fdc85f0eaec551f443cd8513f7acede46bf7118 SHA-256: 73b1a5a4911a4c864729e45d75b5ae0b16ab57078e201c1b21b6b4e04312cd43
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 heuristics indicating it is part of a link farm and uses an SEO redirector for 'free-download phishing'. The embedded URL and the linked PDF suggest a phishing attempt, likely to steal credentials or lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://trafftec.ru/strik?utm_term=vsphere+client+port+connection PDF link annotation
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/wuropu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fc0759457651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f92497ecdf64.pdfIn PDF document text
    • https://munevamowiwefan.weebly.com/uploads/1/3/4/4/134440094/wujudedabuturi-rajupeluxagof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_5fc174e909071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_5fa82e68a981d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/fodutagoxafogolanag.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/51852890560.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/apk_king_root.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/61161541447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7825ba31-2fa1-4079-a55a-e4253228d24e/wedding_march_piano_easy_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/minecraft_free_pc_latest.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 4

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_off0000c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 4776 bytes
SHA-256: 5129c547779940fe169ce791b2cf713379c0411b20c71504a7bc1ec8e71a91c1
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 2004 bytes
SHA-256: 35cb21fdb618efd7041eee26779fe95fdf0a80cdc9fe6086b0d69ce776a47990
font_02_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 11356 bytes
SHA-256: b14fce01cff4e2bd5e5f27aebb1499831ee5136b0fbd162cf7d9fd6c7071086f

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