Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27aa34bde9280ad…

MALICIOUS

PDF

74.9 KB Created: 2021-01-26 06:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 06394ec59846f17ad2b7e5a7ffd90199 SHA-1: 03f45cef87d9681c20749555d08ef49dfe1a3d80 SHA-256: f27aa34bde9280ad0ea1a1140933bc10b7ac4070efd8de1f3a5b83c575896b1a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically pointing to a large number of external PDF links hosted on disposable domains. While no scripts were explicitly extracted, the presence of external URIs and the nature of the link farm heuristic suggest a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=kabhi+khushi+kabhie+gham+netflix PDF link annotation
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/2f3007c756f.pdfIn PDF document text
    • https://zenavepofiwu.weebly.com/uploads/1/3/1/6/131607810/9030740.pdfIn PDF document text
    • http://ionatr.space/34083492567qqpln.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/cc0804a3b2.pdfIn PDF document text
    • http://gouliwer.online/4_in_a_row_cool_math_games_unblockedql6nt.pdfIn PDF document text
    • http://antileqphh.site/react_drag_and_drop_grid_examplecuoe9.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/tuxojoroziwabi.pdfIn PDF document text
    • http://kivedunorujuw.66ghz.com/sakazolururoduludevab.pdfIn PDF document text
    • http://megantv.site/23482668918uktpq.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/lugosuv.pdfIn PDF document text
    • http://pinerapidsrr.com/sleepy_dog_live_wallpaper_iphonelz0oq.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/rifutugedijol.pdfIn PDF document text
    • https://xedaloroxolujig.weebly.com/uploads/1/3/4/0/134018039/3d167cb3f97db.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/gomeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tatasuvuputo.epizy.com/free_red_black_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/personal_cv_website_template_free.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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 5328 bytes
SHA-256: c8e631935bb6d831736550cc1a374db7905e87e29c430ae114657aa0d62a5ae9
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 11320 bytes
SHA-256: 418315888eb2589c056d2107f5c372aa8bcba650a6d173e25dcbb958a57a80e2

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