Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abb2b4ca1e2a5e6…

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 18:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d8bfdd35ec4e1e9652a1246cc6f0934 SHA-1: 145df9f3b157d584abbf8ea0cdfbadc2d8f69fcc SHA-256: 5abb2b4ca1e2a5e6c930dce077fb1917b15143e72dc9530f14f6eafefa514fe7
244 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 alert for linking to known malicious redirector infrastructure and a link farm on disposable hosting. The document body contains garbled text, suggesting it is not intended for human consumption but rather as a container for the malicious links. The presence of numerous links to external PDFs hosted on various disposable domains indicates a likely SEO poisoning or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://ggtraff.ru/strik?utm_term=how+long+is+thawed+chicken+good+for
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/7540865.pdf
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5f9b860572f15.pdf
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/romub-tuneke-vazukamu.pdf
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/3338310.pdf
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/273738.pdf
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5f966cdc3f36b.pdf
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/97cbd2563a4be.pdf
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/4161067.pdf
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/9948062.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5fa7c30e76f96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e38e6ba9-035e-4fd7-be05-2b2636584416/41476081305.pdf
    • https://s3.amazonaws.com/pusori/84277182771.pdf
    • https://s3.amazonaws.com/dabatisew/litosapar.pdf
    • https://uploads.strikinglycdn.com/files/722e7d6d-8384-43c5-95eb-cea6992978d9/r-m269_native_american.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90e.bin
7eb1398cd9d70a7a5aa88db228df921eefb1fce776b9115bc32f2e350b1a0112
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 5400 bytes
font_01_sfnt_off0000db7b.bin
5373603b66b2dbd05c743caa0a220d0737d5e374c4aaed7b22c205a52a1c7937
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10020 bytes