Malicious PDF — malware analysis report

Static analysis result for SHA-256 d374b2ff2b118b75…

MALICIOUS

PDF

67.9 KB Created: 2021-01-16 00:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 431d8143421c8e3be87973f6b7d0560a SHA-1: 7d6edf7f4523cbb16e708bd5866846712fb8575b SHA-256: d374b2ff2b118b75b0c5d9b487c362f0ec4e2be5d2625764d95b425d2342dba6
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable hosting or redirector infrastructure, suggesting a link farm designed to drive traffic or phish users. The presence of a link to a known malicious redirector further supports this. No scripts were extracted, but the overall structure indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=discord+avatar+size+2020 In PDF document text
    • https://cdn.sqhk.co/dejuxafe/6GxCsze/giwesoromiserogoletoxen.pdfIn PDF document text
    • https://site-1176277.mozfiles.com/files/1176277/nilax.pdfIn PDF document text
    • https://pogedefulelot.weebly.com/uploads/1/3/4/6/134628496/barikotazuge-tiwepananusibo-bitukuzewof.pdfIn PDF document text
    • https://site-1218703.mozfiles.com/files/1218703/paxitekuwuna.pdfIn PDF document text
    • https://site-1191111.mozfiles.com/files/1191111/drift_hunters_unity_studionum43.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/Wjgge7v/muslim_day_parade_2019_route.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/lusumusag_riwutufanujeb_pijaja.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/hbijihc/40914646673.pdfIn PDF document text
    • https://cdn.sqhk.co/fomavulobet/UhhfSgh/7090406047.pdfIn PDF document text
    • https://site-1176931.mozfiles.com/files/1176931/greatest_southern_rock_songs_of_the_70s.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/bixizelinom-mulekabemukupar-pedobibam-muvuxeva.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/9K1mdCr/werewolves_2_pack_mentality_maker.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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 5284 bytes
SHA-256: 526fdb6a92862748cb0c51c5cf5b4318324182d0c56f5c9a81a9e5e4ac87d995
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 10400 bytes
SHA-256: d67f88bdf16fe817d23e2c3f55a06061bc5aecdfc08e893412e5ea356d2e3103

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