Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f09a52858a9924…

MALICIOUS

PDF

82.8 KB Created: 2021-04-16 23:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab588d6011991a71ffb5198e3adbf7b4 SHA-1: 19b3fce7b3eadc80eb89e4977e331e290bfdfc3f SHA-256: 17f09a52858a9924bd9e1429afe2c6202050a112a251717e5b24e7ce6732afe1
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 PDF files hosted on various platforms, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+test+gold+real+or+fake
    • http://polobasopika.mywebcommunity.org/82136968425.pdf
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/ecc29551b.pdf
    • https://refiraledekire.weebly.com/uploads/1/3/4/7/134715744/nerimafegavuto.pdf
    • https://cdn-cms.f-static.net/uploads/4425915/normal_6055bb85101c1.pdf
    • https://cdn-cms.f-static.net/uploads/4445337/normal_603d83e711cb8.pdf
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/a2e1eda7050e4.pdf
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/dulupuku_suludojebomuf_gumupamuxasuxu.pdf
    • https://cdn-cms.f-static.net/uploads/4527108/normal_60604d0568458.pdf
    • https://mibudixu.weebly.com/uploads/1/3/4/4/134490534/3a7edab.pdf
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/31c32.pdf
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/folamoxo_tufeg.pdf
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/xexega_jalani_rududajoputunij_ravijube.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_606e79082070e.pdf
    • http://pewodebepefawi.scienceontheweb.net/civic_education_grade_10.pdf
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/wilokoposerobetunize.pdf
    • https://cdn-cms.f-static.net/uploads/4485576/normal_605fbcf9aadf8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://muvamubas.atwebpages.com/gaderijejowogusebujib.pdf
    • https://uploads.strikinglycdn.com/files/f7ca4a60-fc76-40b5-98cb-62c672d3df9c/learn_english_with_tv_series.pdf
    • https://uploads.strikinglycdn.com/files/ad0b2231-3c6d-4db4-87f7-c8b9de31783a/jezemizivafud.pdf
    • https://uploads.strikinglycdn.com/files/19e05e97-dbea-44b7-b3cd-ba4b5ba009b6/worksheet_classification_of_matter.pdf
    • https://uploads.strikinglycdn.com/files/2c9ec1e3-cd4e-46e0-8c04-be2bb052e7ba/91369947585.pdf
    • https://uploads.strikinglycdn.com/files/6efa42a3-b1d1-4899-a4c8-385b2a1119ca/vinabelo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102fe.bin
d1cfe7e35c5b41fb7260d84d95a54782fa834204626948cc159819ce040d9f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 5192 bytes
font_01_sfnt_off000114c7.bin
01c926da7db0aba1f09a1110dadde5560cd61980b21c439da3ff7d0139ae3a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 11788 bytes

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