Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbe54d1f9006dc0…

MALICIOUS

PDF

92.0 KB Created: 2021-05-29 09:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f993bbd054ee11ef39e3047078ecea12 SHA-1: 11238a8d66603d2145305708781bdd4f4f5e10fd SHA-256: 5fbe54d1f9006dc0dac1e334dbab0bd8e3bb8dd4155cfbb28c34f8a5cb92270e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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://xezojetit.ru/strik?utm_term=asi+se+dice+level+2+answer+key+workbook
    • https://buxutagugumazas.weebly.com/uploads/1/3/4/0/134095839/b03603a49bf.pdf
    • https://xanibizodiwanid.weebly.com/uploads/1/3/4/6/134614549/lavaz-voriropegevas-fesulanava.pdf
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/8820764.pdf
    • https://cdn-cms.f-static.net/uploads/4382613/normal_6028efc359c7c.pdf
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/sesimuvip_lidebujad.pdf
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/logokikelimalu-nesedi-tojaxododede-katuwomuto.pdf
    • https://static.s123-cdn-static.com/uploads/4389080/normal_5fc9c37ae3e73.pdf
    • https://sidujojuwizubal.weebly.com/uploads/1/3/4/5/134587716/nojowaget-pavojurulojeda.pdf
    • https://getawotenag.weebly.com/uploads/1/3/4/4/134443600/fabugipofuviju.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_60693a9835f8f.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_600fb5b2ca7d9.pdf
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6062ef1c8e786.pdf
    • https://static.s123-cdn-static.com/uploads/4501482/normal_5fcdb966ac065.pdf
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/7203196.pdf
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/tanipazunitiro.pdf
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/nipiliki.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/nujasukuji.pdf
    • https://zegojigonixuw.weebly.com/uploads/1/3/4/6/134631084/0145e026cc.pdf
    • https://static.s123-cdn-static.com/uploads/4444113/normal_5fe510d31b3a0.pdf
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/jofozefezogopafisa.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/jufafafokugomuzapu.pdf
    • https://static.s123-cdn-static.com/uploads/4371025/normal_5fe04c4e2b71a.pdf
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/veleponubesepot_wijuribuxi_ketiz_lesinolonede.pdf
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/766934c5b80a3.pdf
    • https://cdn-cms.f-static.net/uploads/4460972/normal_6052edb85de80.pdf
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/rubeji_xozex_xizuxitevi_bezonekuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011897.bin
0737297b8e7134af72317bac7170fc4c86322017dc5422a22960b806b4745bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 5220 bytes
font_01_sfnt_off00012a6b.bin
2974687b784a2eb5c40cb82f11213fd043e54bcac200a6f42e35b63ec8a941ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 11932 bytes
font_02_sfnt_off00015292.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x15292 4324 bytes