Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7a78a3b38252a3…

MALICIOUS

PDF

68.9 KB Created: 2021-01-14 23:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 646774da466b86779c2d43b58cdac9fd SHA-1: ff56ef54a48f12c06668014b7cef97779db82c3e SHA-256: 1e7a78a3b38252a3d370ccd78052c47f835f3d9c571a89fcc59e2caf97587ed4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://traffset.ru/aws?utm_term=aphis+form+7001+instructions PDF link annotation
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/c85c59.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/g3w7hhm/w3layouts_smart_login.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/S5DhaAs/planet_pizza_minot_north_dakota.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/gaziga.pdfIn PDF document text
    • https://sexuxuputipod.weebly.com/uploads/1/3/4/8/134855156/1630346.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/hj0nWeo/perfect_slices_fruit.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/velot-kenos.pdfIn PDF document text
    • https://site-1175908.mozfiles.com/files/1175908/chsl_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/jjifHrp/stickman_rope_hero_2_mod.pdfIn PDF document text
    • https://pevopuxavinedun.weebly.com/uploads/1/3/1/4/131406680/7abb331b48c73.pdfIn PDF document text
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/59bbcf3c2a6cf56.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/puretulenuza/4787522560.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_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 5276 bytes
SHA-256: b0a25eba70c3f6b1ebee920d97c624cc2409bd794aeecd62660a82375099261d
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10048 bytes
SHA-256: d0b976676a1996617814261086980e5ba6a761bef5c4dd5e15915581a4b83d14

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