Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbe0f5010a7f3ab…

MALICIOUS

PDF

82.3 KB Created: 2021-03-06 13:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0393c1f746125f82ed3bf24fd1ee22a SHA-1: 25c59628cc92bd85d44d060ef183ad874a8d7ce0 SHA-256: fcbe0f5010a7f3abd523a837a801af803b29dfd1f9836f94a79e564a7bb4c1a8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. One prominent URL, https://baarspo.ru/strik?utm_term=lowest+common+multiple+worksheets+5th+grade, is directly linked to the document's content, implying it's the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=lowest+common+multiple+worksheets+5th+grade PDF link annotation
    • http://buwubaled.mywebcommunity.org/how_to_stop_casio_illuminator_from_beeping_every_hour.pdfIn PDF document text
    • http://hotelhouze.ru/60589968088gn0vb.pdfIn PDF document text
    • http://cucoupon.info/straight_through_cable_color_codeqd59b.pdfIn PDF document text
    • http://mareson.getenjoyment.net/xemufib.pdfIn PDF document text
    • http://prequester.online/ananda_vikatan_vijay_newstq507.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/tcp_ip_model_explained_for_dummies.pdfIn PDF document text
    • http://onlineeshop24.xyz/10845025788h7313.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/dokumezusamugajedafi.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/1748155.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/minecraft_bookshelf_placement_1.14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopinewo.epizy.com/22730264513.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_53869213ac374d53a761a5d460c67f5c.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_5d280b3f62c54e3e8117152374dec5c1.pdf?index=trueIn PDF document text
    • http://puwagof.rf.gd/70278459897.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/english_grammar_check_symbols.pdfIn PDF document text
    • http://zuvemodu.rf.gd/zitaguselutub.pdfIn PDF document text
    • http://danuriluwo.epizy.com/nagomemofarapotuwe.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_ff5517c235dd487ca753d19d3620604a.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_86d09053811e4ce5b37729bb0179191a.pdf?index=trueIn PDF document text
    • http://mukelobader.rf.gd/vulajipugu.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/la_plaza_del_diamante_resumen_rincon_del_vago.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_271a17428fbb41e3bb27d5ec40d9fc10.pdf?index=trueIn PDF document text
    • http://libiwozurogufo.rf.gd/87357410536.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_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 5708 bytes
SHA-256: f97521e5fe39fc709e521eb244959f4d1c935c0dda36450b4c24bea1b24e9749
font_01_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 10640 bytes
SHA-256: dbb63aa6e0adc7bf6571c6f4821abaa8874919bcfb2adafc596c81d6b1c15752

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