Malicious PDF — malware analysis report

Static analysis result for SHA-256 788b6af854acaa4b…

MALICIOUS

PDF

91.8 KB Created: 2021-01-01 06:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3a882f9579736407e5d54f43ca83e10 SHA-1: e839318697707fe69d951b477dfb4bd2bfa35f12 SHA-256: 788b6af854acaa4b11cea23a7ad42fea9c4d96a2006743cd7895195137eabcb2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious or ad-heavy websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate effort to create a deceptive online presence, likely for phishing or traffic generation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafftec.ru/strik?utm_term=best+online+soccer+store+canada
    • https://cdn.sqhk.co/vagekoxes/tcieAmW/71020918919.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/873716.pdf
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/nujanemuni.pdf
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/libemifag.pdf
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/0fc7b50.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/2dd7831474.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8736cae85b1.pdf
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5fd8068480987.pdf
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/susisufamagamoluj.pdf
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/890ef016b8f.pdf
    • https://cdn.sqhk.co/jafiwimeg/iihaugd/63946055824.pdf
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/lokutamonum.pdf
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/b309b829ac5c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/numegubowalonan/things_fall_apart_character_traits_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/9c32b199-3da2-4f8c-bfe0-428997ea1917/tokelorotamug.pdf
    • https://s3.amazonaws.com/babetafaperaxov/postgres_timestamp_format.pdf
    • https://uploads.strikinglycdn.com/files/5ff8424a-0a9d-462c-bd15-76f8a7e18fd2/58518483890.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e36.bin
c39cb8b72e68a437275c5ab03c20f735bce66f48acbbaabf6f18c577935501ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 4772 bytes
font_01_sfnt_off00012e6d.bin
86ca7331d7de1b0e1607924ae10f2773b249867ad419e3abaa0d578710432394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 10988 bytes
font_02_sfnt_off00015374.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15374 4324 bytes

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