Malicious PDF — malware analysis report

Static analysis result for SHA-256 943db3342f4d2318…

MALICIOUS

PDF

93.5 KB Created: 2021-01-28 06:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30da22606e80de8509370475ea775b09 SHA-1: a347c28b782eec691842623ddb88f667cc727cf9 SHA-256: 943db3342f4d23188c304482993f9d272b77f1a3c324bc43d41c841d93b9facf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to manipulate search engine results or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=s+m+l+xl+size+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5fc9ef18f39a6.pdfIn PDF document text
    • https://nalepigetor.weebly.com/uploads/1/3/0/9/130968958/xopak-tulivegula-wumemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5fcb373810ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5fdbec7566a2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_60050463101b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5ffecf158a0e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5ffb171559a3a.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/c3fc187d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ffb43759c656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fd95ccd80f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_600c73bd4c2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_5fd1ccf4dfab4.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/lopirox.pdfIn PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/zezafudekowo.pdfIn PDF document text
    • https://nuxinipimop.weebly.com/uploads/1/3/2/6/132682773/1690781.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/sepawi/ome_tv_ban_kaldrma_android_2019.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_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 3016 bytes
SHA-256: f94113b0d823cd21ee9529555d86d002476fc3b3c9e50b68aab2760f887ca822
font_01_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 5060 bytes
SHA-256: 3a33a548b8e52b07982732662b6c13a20a0877061d2b96a3f1e3b521dcec948c
font_02_sfnt_off0001401d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 11944 bytes
SHA-256: a0e06a86d0b593f44d137d50e4fda5e609c70867afa3eadafd0d1b7080afdfe8

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