Malicious PDF — malware analysis report

Static analysis result for SHA-256 747836cc5b093825…

MALICIOUS

PDF

92.9 KB Created: 2021-01-11 16:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0dd3f2b1ed8e22f5619f55f7c28c2ce5 SHA-1: 7231fc4b7380400bd9d3c1396aee2db5922cd40f SHA-256: 747836cc5b093825a86c1ae6ad2e1f45f6b3fee7743313367cf6831f84938ba9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. The document contains a large number of external links, forming a link farm hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm indicate a likely intent to deliver further malicious payloads or phishing 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://trafffi.ru/aws?utm_term=booty+farm+guide PDF link annotation
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/7629182.pdfIn PDF document text
    • https://site-1173572.mozfiles.com/files/1173572/tudikeluzekev.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/1b25822ad.pdfIn PDF document text
    • https://site-1174105.mozfiles.com/files/1174105/best_skyblock_maps_mcpe_download.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fc2565746c3e.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/riddles_with_answers_hard.pdfIn PDF document text
    • https://site-1174752.mozfiles.com/files/1174752/51123131486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5f8e9cc5074c1.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/7152724.pdfIn PDF document text
    • https://wupumemugate.weebly.com/uploads/1/3/1/4/131407036/nawanuzejuxalur.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/machine_robo_rescue_episode_10.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/a7c36e1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bharat_song_manikarnika_free.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/patopusala.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 5168 bytes
SHA-256: 6890d68cd50a1a2ffc3b2d58de9a7cc9425b4dbb7ccade2966c8cfafeacdfc7d
font_01_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 11248 bytes
SHA-256: e4d3ab8dad69b7c222c8edf136bdf1d35cd2213e7cb7427886af5d6b2f8f8d45

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