Malicious PDF — malware analysis report

Static analysis result for SHA-256 d547e92ada4f73e0…

MALICIOUS

PDF

80.9 KB Created: 2021-06-09 17:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f743f1d8346e3051a03a097b6d9e45f SHA-1: c4abaa0fa657e27c263914ff062bedd0cd44712c SHA-256: d547e92ada4f73e02747d1e2981190d1ced3f64c8a421634d849fe4f9e80ea7e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is detected as malicious by ClamAV and an ML classifier. The primary URL, 'https://synerhu.ru/pbw?utm_term=logo+quiz+ultimate+level+1', suggests a lure related to a quiz to drive traffic to these linked resources. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=logo+quiz+ultimate+level+1
    • https://cdn-cms.f-static.net/uploads/4453342/normal_606d587d404ed.pdf
    • https://cdn-cms.f-static.net/uploads/4475203/normal_5fe789e160913.pdf
    • https://cdn-cms.f-static.net/uploads/4478703/normal_606b555064562.pdf
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/nufogimetode.pdf
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/6de8fcf4e07f.pdf
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/safunarurazujis-latumewegi-gobonara-fexes.pdf
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5fceeb9d82ac9.pdf
    • https://kejopawilut.weebly.com/uploads/1/3/4/7/134709951/digisubivi.pdf
    • https://cdn-cms.f-static.net/uploads/4470832/normal_602128a5c7447.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_60c0216c6cb28.pdf
    • https://cdn-cms.f-static.net/uploads/4464055/normal_6041391f9a3b2.pdf
    • https://nigepopevoxi.weebly.com/uploads/1/3/4/8/134881291/gemujumuvowu_wizegabomone.pdf
    • https://cdn-cms.f-static.net/uploads/4465930/normal_60ba63223dc98.pdf
    • https://cdn-cms.f-static.net/uploads/4479674/normal_60585cc27a9f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kigiputilik.pbworks.com/w/file/fetch/144633234/automotive_preventive_maintenance_checklist_form.pdf
    • http://jizakatum.pbworks.com/f/wudonigogixeleteten.pdf
    • http://xugilip.pbworks.com/w/file/fetch/144506559/quantitative_and_analytical_reasoning_mcqs.pdf
    • http://faxofapuf.pbworks.com/f/96924115543.pdf
    • http://detomipipu.pbworks.com/w/file/fetch/144713508/16255414400.pdf
    • http://tubekikewabi.pbworks.com/w/file/fetch/144451095/zufotefobipeduluzu.pdf
    • http://dibesusajob.pbworks.com/f/34886156183.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_off0000ff8a.bin
f69f15e08deefc3a09f46c357cccd59b81b31f88a7e1d6b3cd7b29100985d949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 4960 bytes
font_01_sfnt_off00011073.bin
699e38801e35c905fc38eb7f9019e9960d387ecf31ee643a928880d2b8e1fed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 11068 bytes

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