Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96af7fec095b7b9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-10 02:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 55d202271849e5bec055761908412e7b SHA-1: a5cbcffa3d3186a09cf1e9a619e158e70ceae214 SHA-256: c96af7fec095b7b94c2e53cd13cbab414cc0b3c2051b181a73f11c5989038226
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=action+words+that+start+with+ma PDF link annotation
    • http://shoop-ff.ru/demotefmjjgz.pdfIn PDF document text
    • http://kzrovk.xyz/fedemufarubite16h7u.pdfIn PDF document text
    • http://webmastervlad.ru/kitchen_wardrobe_sheets9ujkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_601d8cd6057b2.pdfIn PDF document text
    • http://detonic-deutschland.website/rewoded4wlgv.pdfIn PDF document text
    • http://ionatr.space/324476668795wodg.pdfIn PDF document text
    • http://eeuuurrrrr.space/29633376249s3ohh.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/pazogewuvibaxuz.pdfIn PDF document text
    • http://1cats.space/mubovitezunagopapufariljx2n.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/a2e1a09a7f8b5a.pdfIn PDF document text
    • http://zelopaqq.xyz/1404088941115an2.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/vumumizuge.pdfIn PDF document text
    • http://nout-sale.site/introduction_to_distributed_algorithmsd3g04.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/ranut-nobamejuveribi-bopelob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fc85fe110dc4.pdfIn PDF document text
    • http://stingeksoj.online/59484502561dbn4n.pdfIn PDF document text
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/netuj-xizalasavu-lowaduvoloxe-noteriruxig.pdfIn PDF document text
    • http://ilkertr.shop/2003_dodge_durango_3_inch_lift_kitl76cz.pdfIn PDF document text
    • http://grampus-shop.com/982625297551132x.pdfIn PDF document text
    • http://nutristrike-shop.ru/pigamejebtilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_6045ef8f01b6f.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/brand_design_ruud_boer6j8z7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5ff47b9370230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/cotton_on_group_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/domutamifapuremovogek.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/cover_letter_template_for_accountant.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/algonquin_power_and_utilities_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/biblia_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_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 5228 bytes
SHA-256: 751865cc356c73fbb33a1f2d2cea69dcc123c6a33931f9163bd6ce8c447958ab
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 10032 bytes
SHA-256: 304a2bf58e88c083a01a43e21e2df3773df2166cef6d2bbcdfb707633e91e773