Malicious PDF — malware analysis report

Static analysis result for SHA-256 a156a18ae6814cfd…

MALICIOUS

PDF

84.7 KB Created: 2021-01-18 19:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9da729376be4fe2752a5f8b747d8be05 SHA-1: 9ede9471ced374ae386d044d23c7297c67a87184 SHA-256: a156a18ae6814cfdb6296f7c53c58c4e35f62afd3b81987f62e8650507459f4a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing numerous external URLs. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be directing users to a large number of external sites, some of which are hosted on disposable domains, suggesting a phishing or SEO spam campaign. No scripts were extracted from this sample.

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/123?utm_term=hands+free+masturbation PDF link annotation
    • https://laxafukiwa.weebly.com/uploads/1/3/0/7/130738625/vinovikosisib.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/aohcjdn/54402053213.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/naie2lY/pepeta_nora_fatehi_mp3_song_download_mr_jatt.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/f218e3f986af.pdfIn PDF document text
    • https://site-1175027.mozfiles.com/files/1175027/5_nights_at_freddy_s_coloring_book.pdfIn PDF document text
    • https://site-1172851.mozfiles.com/files/1172851/minecraft_screen_recorder_mac_free.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/petukepoludova.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jcgcjii/87281731457.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/3ds_max_shortcuts_keys.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/sBd4Xhh/jaxekeluvifude.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/b3x06ic/city_racing_3d_mod_apk_happymod.pdfIn PDF document text
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/wesederowelokorot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kajomeki.epizy.com/wabadu.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_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 5120 bytes
SHA-256: 6b1f7262aeb952ad56ec053d516e1646027d402e699288dc2e042dad3794e1b1
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 11312 bytes
SHA-256: f6ca66a022c3da8fdb16467b1608d757b4f3a035c12bc714fb631e405badcb4b

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