Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd87aa03cf120612…

MALICIOUS

PDF

78.2 KB Created: 2021-05-11 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 028126e90af875cc9e4ef9aa83c7f5ce SHA-1: 6e9137f656123c43e49b685e73660cfd67f75f70 SHA-256: bd87aa03cf1206121d4f75f7d91e5bc70d1387374105647dced12dcbbb8362f8
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, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=2001+buick+lesabre+reset+service+engine+soon+light PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5ff196a88ea37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_6055defc2c810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_6028e95561851.pdfIn PDF document text
    • https://jekugisolidib.weebly.com/uploads/1/3/4/0/134097103/19496518e.pdfIn PDF document text
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/zetutorodokomej.pdfIn PDF document text
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/e2cad7d2c912.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/4583815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_5c6d88611f49413fb18223daed19a763.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_bab182ca7ae84c4eb44f0bb4f4495704.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_13ac0f2b3c8f431eb3b9925060773208.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_7b281a292e3c45fe8c614b779d7814db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/xemukuwelanajukod.pdfIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_265ecb1c3b4448208aeffeb349a27a5d.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_59f4bf01c9c142b399753d4b346a5b63.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_852e0ef761af48a4b5b97ee78bf61628.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_120ff4bd1efc4ed6aca93deda5a653af.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_02492bd4d7174a2a86a8004b14b6a9ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/arterial_blood_gases_made_easy.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_48c2c52688cc4769ade94447a35b7b9d.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_867a11103ad645ed963ee0558f155b22.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5436 bytes
SHA-256: b77a356f5445f7242977979c39b4cb0f4b6588319c5f395cbc312e1c982aff0e
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 10776 bytes
SHA-256: 01077edea29075aff0ec23cc75a9758652a33cb05a2f3ce65e2af2fcc8978e5a
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2