Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf60c8c9053164c…

MALICIOUS

PDF

89.5 KB Created: 2021-04-29 05:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f2867c7f9620fd3e1093ec3eb02f78 SHA-1: d487d84799815525fde6d1e2c25735e6202e3d7b SHA-256: 9bf60c8c9053164c6c2a808642972ec8c619d891f648791ceaebdeb6a2c67183
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

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://zajinet.ru/strik?utm_term=uppababy+mesa+install+fabric
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/gumidol.pdf
    • https://rusokakes.weebly.com/uploads/1/3/4/0/134016884/3284621.pdf
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/gudedodunagusenovado.pdf
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/dedunates-tumemuzipu.pdf
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/wagag-lekigilopamoz-lusij.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_603702eb92c80.pdf
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6066d5996288c.pdf
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/mudaxi.pdf
    • https://cdn-cms.f-static.net/uploads/4420743/normal_60435ccf8fc38.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/gakilubavomal_mulas.pdf
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/539f7ea63344d.pdf
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fd628f363a0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_33777fda577f4e35b2038b2b07a29d2f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77affbc0-1450-48e2-86d2-3984ee282369/xaxesogabivadiga.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_8bd2227592f04654b9d3f8cfb4acd7a4.pdf?index=true
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_0a0634811a724f7d8b8cd96423d668cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a6143e0-44ed-4bd3-a923-0369adf4d1d8/xevogasibumijuzileb.pdf
    • http://wawapudatubu.epizy.com/28973400543.pdf
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_d82f21c26d514cfbb138c1ffeace8741.pdf?index=true
    • http://toxiwudogosos.epizy.com/yamla_pagla_deewana_2018_movie.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_off000112a7.bin
de1c4f92b799d29e9fc4edb0c04f769cfabe661e335c2ea0bd7492c9103074c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 5072 bytes
font_01_sfnt_off000123c4.bin
399af5f506d0abdbe40feeeac36e7571dcc187bf49e6895c5b93e42958630b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 10792 bytes
font_02_sfnt_off00014899.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14899 4324 bytes

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