Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e735a166e110eab…

MALICIOUS

PDF

68.8 KB Created: 2021-06-01 11:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1acc100c35442ceecf0660f2d5a2b49 SHA-1: 80cd9c801370a3339deff20c5b02684c2543ea2d SHA-256: 2e735a166e110eab926f9ef029f80765f2b3ce518680e0f1a6b42891185f7c2c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'crewmak.ru' disguised as a guide for fixing a convection oven. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, likely for 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://crewmak.ru/pbw?utm_term=how+to+fix+a+convection+oven
    • https://dobidikomopal.weebly.com/uploads/1/3/5/3/135302797/c66103dac10b5.pdf
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/mojadu-fawos-kopigese.pdf
    • https://gerutabelamulef.weebly.com/uploads/1/3/1/3/131384559/57580.pdf
    • https://sanejivuzagegu.weebly.com/uploads/1/3/2/7/132740711/votutuzu_kegokupa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4b750ed-5976-45ed-88b2-03ee780128e9/lokalorilokis.pdf
    • https://uploads.strikinglycdn.com/files/36e78458-b426-47dd-96c3-7eb5870efd9f/qlik_sense_user_guide.pdf
    • http://labidan.pbworks.com/w/file/fetch/144447312/mikigox.pdf
    • http://mumubib.pbworks.com/w/file/fetch/144412116/how_to_identify_herpes_zoster.pdf
    • http://zajozote.pbworks.com/w/file/fetch/144444297/is_raft_still_getting_updates.pdf
    • http://visetululiv.pbworks.com/f/duxupatunuraw.pdf
    • https://uploads.strikinglycdn.com/files/dc708079-2a56-4c06-9444-50d537726d67/is_gimp_as_good_as_photoshop.pdf
    • https://uploads.strikinglycdn.com/files/d63b5a7a-bf8a-4e7f-bd44-0fbe7ae7fdfa/12_bible_study_methods.pdf
    • http://tisowowuduwe.pbworks.com/f/ridos.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144439317/24653337026.pdf
    • https://uploads.strikinglycdn.com/files/c33e9ae6-bd86-4c6c-bb42-9cbb298d2488/mipekinus.pdf
    • https://uploads.strikinglycdn.com/files/f493053e-1e8d-47de-ba2a-8e2a408a8053/how_to_use_tasco_trail_camera.pdf
    • http://povelin.pbworks.com/w/file/fetch/144423357/engineering_drawing_text_book.pdf
    • 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_off0000d283.bin
aedea1171936f829b897832c1273b56d7cae2564d1de066a6bea4b44e6fdee35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 4752 bytes
font_01_sfnt_off0000e2e1.bin
6401f5359371563d75f5583a14f2fe2fe2ab88ef485af8dcfac9b36129bdb9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 10396 bytes

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