Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c5e5c9cfcaccde…

MALICIOUS

PDF

74.9 KB Created: 2021-06-01 17:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d444a96baa2d30329b0edade9af0237b SHA-1: 1cee4bbaa0cb2b76171c8589c0b3f1f4c177f0b2 SHA-256: 71c5e5c9cfcaccde516836007dabb1716b8654212f3623fe2c6056ba470d324f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://allytemp.ru/pbw?utm_term=how+difficult+is+it+to+assemble+a+nordictrack+treadmill
    • https://tozetabibu.weebly.com/uploads/1/3/7/5/137500879/valiboki.pdf
    • https://vatawasuri.weebly.com/uploads/1/3/3/9/133997312/d827adbd6c4018e.pdf
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/4221722.pdf
    • https://famigupew.weebly.com/uploads/1/3/5/3/135302829/5623847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tazijebep.pbworks.com/w/file/fetch/144420135/plantronics_backbeat_fit_3100_pairing_mode.pdf
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421794/51978280902.pdf
    • https://uploads.strikinglycdn.com/files/78ed0380-3957-4b5f-ae58-1dc0558dec02/15561030367.pdf
    • https://uploads.strikinglycdn.com/files/383e83f9-bf02-4a03-9d20-3e404e4e531f/83271205255.pdf
    • http://jujirafamena.pbworks.com/w/file/fetch/144465498/24435255543.pdf
    • https://uploads.strikinglycdn.com/files/d0030daf-69c3-4e8b-8e78-a3b4fee22ee9/rezawawividisekigumu.pdf
    • https://uploads.strikinglycdn.com/files/5a2697a7-e752-496a-b9f7-e80eb67c3325/how_to_dress_for_disney_world_in_october.pdf
    • http://mefijunov.pbworks.com/f/zulenumelopiwugugorosom.pdf
    • https://uploads.strikinglycdn.com/files/fd3d698a-fbcd-4fdf-a479-553e2ccf87da/where_to_buy_paper_shredder_oil.pdf
    • http://jozeluwofe.pbworks.com/f/perumivamofilukip.pdf
    • https://uploads.strikinglycdn.com/files/aaf04417-43f5-42d1-b8b9-a2c328b8dc24/sunutoxitej.pdf
    • http://poxanoralanu.pbworks.com/f/96116440144.pdf
    • http://kinuwibe.pbworks.com/f/achyutam_keshavam_krishna_damodaram_mp3_song_download_pagalworld.com.pdf
    • https://uploads.strikinglycdn.com/files/3b7f95b8-01a6-4ba2-9ccf-8d9883d16b52/myles_munroe_net_worth_2014.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_off0000e6d5.bin
77c9672255001197801ca73194019a0466374ffdf615be82085e13468b19a25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 5424 bytes
font_01_sfnt_off0000f944.bin
ee3ebcb96cf8d1321aad016d9a77937d3476be23bf35de7ac61282d8364afaa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 11660 bytes

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