Malicious PDF — malware analysis report

Static analysis result for SHA-256 5250ae89e208e7a7…

MALICIOUS

PDF

86.0 KB Created: 2021-05-29 03:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af985f055825822d339811bd18b8f62c SHA-1: 29609984c2e759bbb204f9ef9935416785d33c26 SHA-256: 5250ae89e208e7a7ccef0c33647e45486287ebdce8c90f578da3b10e5b06b089
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for distributing phishing content or redirecting users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms suggests an attempt to lure users to potentially harmful content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=what+did+it+cost+meme+thanos PDF link annotation
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/5dfbcc7e46363b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe7c3a9234b2.pdfIn PDF document text
    • https://buronunizapa.weebly.com/uploads/1/3/5/9/135956875/6138337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_6025193dc007b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_6056663aa38d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_604e280e0aae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420610/normal_5fced453ea9ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fefbd9768417.pdfIn PDF document text
    • https://faraguwu.weebly.com/uploads/1/3/0/9/130969294/jurivimitas-wagefegovuv-domuxotoragamus-pisuzebiromesog.pdfIn PDF document text
    • https://vazanekufom.weebly.com/uploads/1/3/5/3/135322674/98d42ecaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_602eb5226fdbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408582/normal_5ff893ff75b7a.pdfIn PDF document text
    • https://feselezoretun.weebly.com/uploads/1/3/4/6/134690260/xapis_bixikuzoto_sagipifago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_60598af437d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_603603c0907a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_602cd868d9a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_606786eaabfbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84d10e3-0f95-4fbd-aafc-ff4d7d3873fa/vexelonujoxodedila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082253b0-4a67-4e41-be2c-baf55215e89e/what_race_has_the_highest_prison_population.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7059ec54-c830-4d14-adb0-a10398de11f5/gebalikokebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1525730-f8a4-4673-a783-a943ca26e2e1/zebagesoro.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 5064 bytes
SHA-256: 868c44f0d26e63339c575d427dfbc9b0b5d4a6c062036fc5e3d30bb28837f476
font_01_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 12568 bytes
SHA-256: 3e79b142c2db54472af8d23fadc996dcd6efd6959028e33be3d6d3e586b8a7dc
font_02_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 16096 bytes
SHA-256: b116d555496960b1001cf6c696eea8d4db69ac652c8811f9a70fd582a21e1c02