Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7686a6d1a4a6095…

MALICIOUS

PDF

73.1 KB Created: 2021-06-10 01:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6160218c2431b7d21ea73218c63f5fa6 SHA-1: cffde7dd31e5953604bfb512468c24d109d5b71f SHA-256: f7686a6d1a4a60954dacd0b96138aa1cb5dea3be0b246434669faa1261edbc0e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://huntic.ru/pbw?utm_term=ramanichandran+novel+download+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487665/normal_60117d5b4589d.pdfIn PDF document text
    • https://lesidodulutenem.weebly.com/uploads/1/3/4/3/134352412/kikero_dajenejebel.pdfIn PDF document text
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/zavaparasapeg.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/508527.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/vobizototiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_606284b1409ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_600b4da656cec.pdfIn PDF document text
    • https://vafubetuxako.weebly.com/uploads/1/3/4/5/134503762/f11d4e62085.pdfIn PDF document text
    • https://widedopeb.weebly.com/uploads/1/3/5/9/135970132/bulakerijowe.pdfIn PDF document text
    • https://nefadojajekewa.weebly.com/uploads/1/3/0/8/130874163/2429313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobowal.pbworks.com/f/filmora_pro_cracked_apk.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144426162/lukeref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a40974e-3c3f-442b-b476-ce06bcee89c1/does_the_romeo_and_juliet_law_exist_in_texas.pdfIn PDF document text
    • http://bopidix.pbworks.com/w/file/fetch/144621651/baxopabosanomagurujowozoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2437fc1-c4da-42d9-b9ee-27a1c9307955/libert_paul_eluard_texte_intgral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e4019c-ab24-481b-9542-1cf3dc7334ee/shanghai_disneyland_park_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a14a4c-51e8-47f4-ac1d-1f2c6fc3283b/zarajofoporekumuvikage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64216173-a8d2-4a74-8b63-6832abcd7d3f/imagery_in_romeo_and_juliet_act_4_scene_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327a92ef-6f5a-4051-8d0f-ed43a910cf39/jimuzobaji.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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 5376 bytes
SHA-256: b2167da3c579e07c0d9b0d9da0c977cfd807caa0c72a0e72a123925e50afc0b3
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10960 bytes
SHA-256: a66cdc721cbb3cc9caf150a747093f2bc93d4636100e1d499b88edd4d5f61b3a