Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fe883c903cbe58…

MALICIOUS

PDF

79.6 KB Created: 2021-02-20 15:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 55d617d3d5b8da9b96987784d21fe466 SHA-1: a970e30384a27e06d82018c252af823d14c07fbc SHA-256: 86fe883c903cbe581d30e65074b94aff2e08fd3c6870bd69292064846f1fe8ac
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though truncated and obfuscated, mentions 'survival food kits for diabetics', likely a lure to drive traffic to the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=survival+food+kits+for+diabetics PDF link annotation
    • http://teleporttur.ru/91095604141poq29.pdfIn PDF document text
    • http://montana-media.com/rain_down_jaime_cortezqwfd5.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/pabowiralobep-gofefoxuvaluma-pizadamokigixe-rilekobejutajas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_6017ad3c9b13d.pdfIn PDF document text
    • https://damowovevibip.weebly.com/uploads/1/3/0/9/130969764/9963683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_60160b9473322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fddaf679a164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_60307ad32c16e.pdfIn PDF document text
    • http://axecheat9.xyz/pupofipajatejevomivonelulookrt.pdfIn PDF document text
    • http://proba7.xyz/psychology_applied_to_teachingi5k5s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_602b9796bc832.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/Ojfjbic/fun_facts_for_kids_about_animals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_601b83d7203d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_6018d7c9633ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ffe988fc27e2.pdfIn PDF document text
    • http://lollipopa.online/42448599898d2hff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_6018a2d36f25c.pdfIn PDF document text
    • https://zufitamel.weebly.com/uploads/1/3/5/3/135349526/5ff7775b293.pdfIn PDF document text
    • https://zipakodexosif.weebly.com/uploads/1/3/5/3/135344546/bdda82c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5384 bytes
SHA-256: b4b2996570d34b53100a2ff67cef5b2c85f429bcb861921763e509d660c97552
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 11072 bytes
SHA-256: f5b3a462c8d1606f82ba06b7cbeafad111b4e137ad2fba9d50752260fdf443ff

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