Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eeb3ecbee8d03e…

MALICIOUS

PDF

63.5 KB Created: 2020-11-25 00:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7673afd3c186aa9e585c29152cfc171e SHA-1: 437635e67a08ee42d263e73d7d9aa34adeb9c2aa SHA-256: 43eeb3ecbee8d03e4c87c896146c09f8909f14dfe3ebb86b9d30376602a49028
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. One of the primary external links, 'https://trafftec.ru/123?utm_term=mcmush+lab+virtual+lab+answers', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier also indicate maliciousness, pointing towards a phishing or trojan distribution attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=mcmush+lab+virtual+lab+answers
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/3aa8666b.pdf
    • https://nukoxifade.weebly.com/uploads/1/3/4/3/134332817/doxuwolaziledo.pdf
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/5663482.pdf
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/7835742.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/5095099.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zemigiduwagafu/jumivojodemilefudodi.pdf
    • https://s3.amazonaws.com/nabifovu/wagabekuboxiwusufe.pdf
    • https://s3.amazonaws.com/paropabaru/bitsat_question_paper_2017_download.pdf
    • https://s3.amazonaws.com/rizezobabub/spelling_test_grade_4.pdf
    • https://s3.amazonaws.com/megodipewukitoj/vilapezudum.pdf
    • https://s3.amazonaws.com/zetare/st._paul_mn_white_pages_directory.pdf
    • https://s3.amazonaws.com/vososasoxumete/industrial_craft_2_crop_breeding_guide.pdf
    • https://uploads.strikinglycdn.com/files/ef6677ec-0149-48d4-9031-3d2d92dcc9ee/tabaloxitatuzupafaz.pdf
    • https://s3.amazonaws.com/jeponowon/18_mbps_good_or_bad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae9e.bin
178a4e26029cf2864a4cbe63f90d65d4f1e0b47234d88afcb86db943a648e517
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9E 5108 bytes
font_01_sfnt_off0000bfed.bin
b4e1cc9190448f97b504406f4924ac9d1cb458d3121ec1f3b4c79c8175796130
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 9924 bytes
font_02_sfnt_off0000e18b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 4324 bytes