Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd035361ebaf3be9…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5fa17ddb28997f3dda5b1f754beba807 SHA-1: 2db3285a59ddeb2bcde07c515632acf5cd3caf09 SHA-256: fd035361ebaf3be946660fe36897f9aa178a93a9f9702fdb9544d04aea907128
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the link farm nature suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nipisod.ru/123?utm_term=apple+music+app+won%2527+t++to+iphone PDF link annotation
    • https://mopuxemunokele.weebly.com/uploads/1/3/5/3/135318458/0e990bb50.pdfIn PDF document text
    • http://nnorm-id.com/environmental_impact_assessment_ppt_free_download7xjvz.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/4980128928.pdfIn PDF document text
    • http://dutov.org/jiteworusoxinu2y8gx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_6035455510b80.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/sunenugamog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_605b5ea3da7ce.pdfIn PDF document text
    • http://2022god.com/yugioh_discard_deck5jxep.pdfIn PDF document text
    • http://ooovseanalizi.ru/asus_x205t_upgrade_to_windows_10lpumb.pdfIn PDF document text
    • http://interior.estate/hellenic_paganism_books38zhl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_6023341cc929f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529977/normal_5fdf0e5d53b0f.pdfIn PDF document text
    • http://dostafood.xyz/nufiwuvavosope3385t.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/post_concussion_protocol.pdfIn PDF document text
    • https://mufejuraziga.weebly.com/uploads/1/3/0/8/130814984/wajiv_dudibejib_siretadeto_zukexoba.pdfIn PDF document text
    • http://stonersfranchise.com/how_to_make_a_septic_tank_drainfield7ravy.pdfIn PDF document text
    • http://foodguideblog.com/494890808580nspw.pdfIn PDF document text
    • http://bionatur.space/playbuzz_quiz_celebrity_look_alikew2ypr.pdfIn PDF document text
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/0d390b909fb13.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/roxisimudijuradaxuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_5c188c958080484c8da646fcaac967b3.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_7a7d3ceba17d4637bfe5720253e4cb69.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_93e40ddf604d4f5fa73d85eba0c113b6.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_4bce548163d04a10b4843589165b42c0.pdf?index=trueIn PDF document text
    • http://tulajadulixo.myartsonline.com/30061573553.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_0517ae1498c94e9296b8addbde561fc1.pdf?index=trueIn 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_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 5192 bytes
SHA-256: 5eec5f14d0a14ddd510bfa3cb13c3cdd274fc42bf561eeb70c9af4d9e5378ecb
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10888 bytes
SHA-256: 0d5576739206bef780e7aa3958c619c593ad251e31fd7c01dd4f371826d94f59