Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f5a05a03a2d09a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-02 07:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 00c9b4d2867e22be12aebfe1da4ad29f SHA-1: 31990d90d45fe53f94b88f4be6b0dcb1b781d85a SHA-256: 66f5a05a03a2d09a03557bccec3a7aa491a7763ed8407949f148fa94e7ca09d8
186 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'smidgel.ru'. This suggests the document is designed to lure users to potentially malicious or phishing websites, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://smidgel.ru/pbw?utm_term=homedics+scale+sc-531+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600fcf52d6a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_602b1034b90c4.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/bixos-sotid.pdfIn PDF document text
    • https://jalagowozitaj.weebly.com/uploads/1/3/5/9/135967583/begoxarinulax.pdfIn PDF document text
    • https://redejopodudere.weebly.com/uploads/1/3/3/9/133999864/062b222.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/wabogibonozokon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_60220815eb1bb.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/17a300320f.pdfIn PDF document text
    • https://dajetulanew.weebly.com/uploads/1/3/4/3/134309067/tipatilibenalezija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5fe176ce86ede.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/tabaxizor_tekujetafetud_lesaxapo.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/e57d7f04e32fd.pdfIn PDF document text
    • https://wirujofijiv.weebly.com/uploads/1/3/4/5/134592393/wepexajifivakeku.pdfIn PDF document text
    • https://xubedemowixur.weebly.com/uploads/1/3/6/0/136004279/fidumuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144449775/polytune_2_vs_boss_tu-3.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144426003/rozijinunigivoraridox.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/xeniwawifiwujisonupefi.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144426150/xomoki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 5124 bytes
SHA-256: d127b496124a1316216c22927a60a77152843386cdd0b8c706db95de0908aa8a
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 12804 bytes
SHA-256: cd81f5b998fb30fe4e9c9f248249c39204f9bb6dab1b54ef9512fb7d144c17bb
font_02_sfnt_off000143ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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