Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26e6bea4a545cc5…

MALICIOUS

PDF

76.5 KB Created: 2021-05-24 20:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 844f27750d880d310019fcff6fd789b1 SHA-1: 7d30655b62277cf583029a21f6d72e3a52628600 SHA-256: f26e6bea4a545cc52b467d04df4d33b1cbcd20d78f0e3d90472b4a4209600d88
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+do+a+manual+j+heat+load+calculation PDF link annotation
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/45acf.pdfIn PDF document text
    • https://makemefezixila.weebly.com/uploads/1/3/4/3/134355794/c8dca1e.pdfIn PDF document text
    • https://tiparopodewab.weebly.com/uploads/1/3/5/3/135340776/dufobiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_600e021914752.pdfIn PDF document text
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/4002152.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/6001551.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/jolutawumukisu.pdfIn PDF document text
    • https://dusukipujadun.weebly.com/uploads/1/3/1/4/131437174/zivaloduzebutov.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/juteronenirila-kuzib-vazudusavowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_60491fc220447.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/godaromizopu.pdfIn PDF document text
    • https://durezawower.weebly.com/uploads/1/3/4/4/134472500/tomoso_memadizejuna.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/2456944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_602620d3af103.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/gebure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_6024c44b1cad9.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/vezumobigodub/disgaea_2_dark_hero_days_felony_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/ribago.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/instagram_ios_6._1._6.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5036 bytes
SHA-256: 8c2efbd87f74a0a4a3ed6e77cbd30425e8fa31000d585fec2fa401e555062353
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 11192 bytes
SHA-256: 9a7fa055674b88f338da0d9e41a28078a1a0c4807599bfc3f3986e6b69d9a3b9

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