Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e4daa686f667ea…

MALICIOUS

PDF

73.1 KB Created: 2020-11-23 12:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 72cfbf39b3eb0c78281f0c3730ba9c00 SHA-1: 52d4fbc25b5fb04a4603fd6e46fcfcfead1de3da SHA-256: 42e4daa686f667eac6a5a566c05f283aef739fa43e41b59e87d82d6ce3e6bb53
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=pacman+board+game+target PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5fae3caeb3570.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/9913208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5f9237c6988ea.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/fewifuwu/android_snackbar_inside_fragment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cfeb3b-06fc-4661-9560-0343a7a00b4d/microbiology_an_introduction_11th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eae2bc9-1bf6-40a2-b294-550bf24995e6/spanish_to_english_pocket_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/cotton_creek_links.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/79355512426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a66b71-1eeb-4c19-98da-b7d506e92c7a/wesewaxifirefaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/18937927852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0e74c0-61c0-49c2-8250-67fc60dc34f8/43460546434.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/carrier_transicold_electra_manual.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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 5188 bytes
SHA-256: 2d89e0c34a23ffb003e1655ccd8e586ce6876bad6fa5f6cb28af153fdf862e9f
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10424 bytes
SHA-256: 1da989d9c51bb0eb28f1b75d5900fbf5881144c50406e4e2f57cd0855b16db32

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