Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4570f2de75acf5…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 12:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce450aaee78776999a93e96cf92c4ff1 SHA-1: 9e2e5ebb17f2d8ad04dcddf8792c0c1ca3d078ac SHA-256: 0d4570f2de75acf54d690bace5f3c77d76274d614fee3a72f45867097c02c3ec
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of these links and the nature of the hosting services strongly suggest that the document is designed to redirect users to potentially harmful content or to engage in malicious SEO practices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/aws?utm_term=how+to+connect+2+phones+to+echo+dot
    • https://tukadivi.weebly.com/uploads/1/3/2/6/132695248/kebupusap.pdf
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/goxipagego-seput-kibibedikol.pdf
    • http://apparentlyopt.com/93824527612y1z7c.pdf
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/zevirevexif.pdf
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/siwesixokenojejug.pdf
    • http://byt-upak.ru/gunabidesawukuloleja3i65d.pdf
    • http://moviesaddaa.online/close_up_1000_answers_beginner5n2k0.pdf
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/d654afd23f10740.pdf
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/4c3c8dc2f.pdf
    • http://idealslim-ordina.site/wevejewezenezegizexoxipepq17p9.pdf
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/niwepep_pagerovopu.pdf
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/kefexuvos.pdf
    • https://maviruwatibifiw.weebly.com/uploads/1/3/4/4/134490209/5563872.pdf
    • http://lunagogafoxoj.sportsontheweb.net/budawigowifut.pdf
    • http://neuroncraft.online/941393282382cx32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e9a87060-6f0a-4825-a998-ee476ab5cd33/3d_logo_design_software_free_download_with_crack.pdf
    • https://uploads.strikinglycdn.com/files/879af19e-2a85-4986-a713-1b7d256f55e1/stop_strategy_for_writing.pdf
    • https://uploads.strikinglycdn.com/files/c3b946e8-9b78-479e-a761-bb849af937b0/12762391080.pdf
    • http://wuwedilejom.myartsonline.com/capites_da_areia_jorge_amado.pdf
    • https://uploads.strikinglycdn.com/files/1414bc3f-3913-4858-ae81-b6576c3b7717/vefobifo.pdf
    • https://uploads.strikinglycdn.com/files/45f5c97c-f049-41a1-9448-bb3f46657534/tucker_turtle_at_home_spanish.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_off0000ea87.bin
a5e59df8c440e71ac831ce89e06f6e439fa11db49dcf9477af205036c63ed88d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 4748 bytes
font_01_sfnt_off0000fab1.bin
a82ce96ea0b11671f77e3f39b4f6ef92048bad52e38066312b397e90657ffa42
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 11048 bytes
font_02_sfnt_off0001200a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 4324 bytes