Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72b85400dc3a21b…

MALICIOUS

PDF

69.6 KB Created: 2020-12-07 09:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9e879c652b669d77e0e399712729d63 SHA-1: 1d872a38a559ca2aa97888682fc005c6ad840166 SHA-256: b72b85400dc3a21bbe898d3770b3733a673d2e3caa79df85b6d25dd534c7a9c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with one pointing to 'https://traffset.ru/123?utm_term=vixia+hf+r800+review', likely to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of numerous embedded URLs strongly suggests a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=vixia+hf+r800+review PDF link annotation
    • https://mebijakonenu.weebly.com/uploads/1/3/4/4/134458360/3864319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f99d4357538c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5fada78b27519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5f9a80ce81333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7d86a2-9ba3-4867-9789-9f1bab22edfb/janie_lou_gibbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1bdc01-82e2-4941-82da-fee42f5f5d8e/winnie_the_pooh_pack_n_play_graco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2848362a-f9e4-47b6-a47c-015efdfc85a8/70574633610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406d6f22-9f76-48c0-8e31-98320891812d/ludarivovok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb09ac1-b12d-443a-b886-2375ed61148c/dusakadutijumorubeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace00156-648a-4fae-820a-d699a0b1b60d/noxavoxivosilelosuvifaxif.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_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 5164 bytes
SHA-256: 6777ee2786f11328295e687d78065129d19d7715f383ea3cca27211c247a7a63
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10960 bytes
SHA-256: 572c4e67a6c61b3b233e4ed2be1829c535ed149f31d45dfd4c6736fbbf45c97c

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