Malicious PDF — malware analysis report

Static analysis result for SHA-256 41008e800f740a79…

MALICIOUS

PDF

73.8 KB Created: 2021-03-11 10:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67652511cc097670511076c64e295b40 SHA-1: 2b241617eb557a8c2f2194e1102fc079e9acf05a SHA-256: 41008e800f740a79fee12e650b2aef65650ac7f11086a26310ee80cee67f0b4d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are obfuscated or point to link farms, suggesting a phishing or SEO spam campaign. The embedded URL 'https://jacksth.ru/strik?utm_term=how+to+map+midi+controller+in+fl+studio+20' is presented as a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jacksth.ru/strik?utm_term=how+to+map+midi+controller+in+fl+studio+20
    • https://cdn-cms.f-static.net/uploads/4450248/normal_601db66e45286.pdf
    • https://dosoxikovere.weebly.com/uploads/1/3/0/9/130969917/55bf7745c058d.pdf
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/5368489.pdf
    • http://just-gopro.com/rank_of_a_matrix_function_in_matlabyx2yu.pdf
    • https://xabejopoturidu.weebly.com/uploads/1/3/4/3/134352457/widifuvevekurutamemo.pdf
    • https://naduxirakolanin.weebly.com/uploads/1/3/5/3/135304083/padewatoriratopotaxo.pdf
    • http://english-10.site/on_the_banks_of_plum_creek_free_audiobook9mj99.pdf
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60143b2cc48dc.pdf
    • http://tersq.space/excel_formulas_in_hindixokct.pdf
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/kowijigisovuvet_wifituxab_fuwugilidumit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_41b4f5ba467c407db1eb0eb587fb0b7d.pdf?index=true
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_ba239c0d127f4bc385d4175ad907bd0c.pdf?index=true
    • https://s3.amazonaws.com/muvemasoxaji/dupej.pdf
    • https://s3.amazonaws.com/zarusegibitumet/air_cargo_manifest.pdf
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_0b2f6b817a8241e2a25c53e93c59290f.pdf?index=true
    • 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_off0000e33d.bin
307203fe842b6b607556ba582f528cccf5777436286355addbbdd65010c76bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 5628 bytes
font_01_sfnt_off0000f662.bin
c02cd7463396231f987a34ea5a775245073f446f375df0c98c2f54e6ec8115b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 10556 bytes