Malicious PDF — malware analysis report

Static analysis result for SHA-256 91392f61b1a8f5fe…

MALICIOUS

PDF

64.5 KB Created: 2021-01-14 07:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 97812b56096806c45c8d11db934dbf46 SHA-1: d08bc0d05182ef04bc3157e6cb0768dd4a2b10a5 SHA-256: 91392f61b1a8f5fe42e23c4ea592ab58542d81d8bd3607ef2a03ba5dbf7d1d1a
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 pointing to Weebly and CDN domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=fixed+asset+management+software+free PDF link annotation
    • https://febasenijig.weebly.com/uploads/1/3/1/3/131379808/goxatorarud-kadola-dasixopeji.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/gdohchg/zifanumulefuburala.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/IXjfHjf/vimorab.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/liwatoxozosu-zikugis-wisetuzepaza-gafunija.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/SjijsE3/webitizina.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/idhIFhh/77335001521.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/khe49XI/lobadufixalan.pdfIn PDF document text
    • https://mobugozuko.weebly.com/uploads/1/3/4/8/134869294/69cd8198d3feb4.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/blockchain_wallet_with_1_btc.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/mamukawaxatali/get-_healthreport_activesync._protocol_unhealthy.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/85289801039.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/onychia_of_toe_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/35782608486.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_off0000c1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 5308 bytes
SHA-256: 65cd275664b22b3f647ba365a83829a3b203b460566b43635e5ca115479b2ef1
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 9672 bytes
SHA-256: ac30d29766203b412541c20e0a261f2f12e14c3cc57bbf5cb398aefce8188c98

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