Malicious PDF — malware analysis report

Static analysis result for SHA-256 b792db0d5884a51a…

MALICIOUS

PDF

82.5 KB Created: 2021-04-25 10:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c1646b6e8ae0b89ea8cb6ec68a5c2fa7 SHA-1: f8971c931c416e99682a71195e827a5d65430662 SHA-256: b792db0d5884a51a9eda5727faa06384f9481077d3c85f135460cb5e2bae93b3
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation. One of the primary external URIs, 'https://vilenefex.ru/strik?utm_term=georgia+wic+form+1', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the overall structure and link farm behavior suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=georgia+wic+form+1 PDF link annotation
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/numusuragotoj.pdfIn PDF document text
    • https://welusagosa.weebly.com/uploads/1/3/4/3/134355806/koloposi.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/botatidedeni.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/dorulu.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/duwawinuvu_dagomafaj_gekakuxekele.pdfIn PDF document text
    • https://bujubupe.weebly.com/uploads/1/3/1/4/131437121/74f17b.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/widepa.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/rejiner/goodwill_assets_balance_sheet.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_879e3b3000ac4797ad358b9b5186c801.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_4e0d6455a53d44d58b06edd4cd4323c4.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_a9afb78f6991482eb539f19e62f8b204.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_6bf8554dc59046dea316cb8af407c99f.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_2d1add625ee349d08b769f277476ec5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/dewalt_10_miter_saw_cordless.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/movutur.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_8ba1d8b96a9342e0b3eb209731161e2c.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_924255bf2706418a96a07e6539bf0f98.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_35b80ecdafdd45e2b381ee069432bece.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_7462b1962c554de9a4b18470c4d7df95.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 5168 bytes
SHA-256: d36174f4104ad2c05a121a9ad70b0d4ac286a3e19755a8e635d257c74a4be957
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 11280 bytes
SHA-256: 6e0367126d8ade2107ca822373d82df936be2822174a1a6762446be67eda7d2c
font_02_sfnt_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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