Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc0a6643d9b5b94…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 08:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e208ed8142ec6cd8272ea226d5521565 SHA-1: 790edb850131b6facee0b3f27a6539ad3c7d005c SHA-256: 5bc0a6643d9b5b94923ed2ce201dd4ebda0a0171bf44bd7ca6056bc39cff03f2
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 hosting and acting as a link farm, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a site that serves a second-stage payload. The document body text, though garbled, appears to be a lure related to audio recording software, suggesting a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=can+audacity+record+computer+audio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5ffc11a573d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6069366d847c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370080/normal_6004caa0b0ca7.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/85798711732.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/64496103119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_601653a7ee902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fddfdf02ddfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fd316d1926bd.pdfIn PDF document text
    • http://top-salez.site/warozekejimowitewfkrr1.pdfIn PDF document text
    • http://mif-smeh.space/664220010575qlmj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d552fd7-ddd7-4361-8e76-52cdfa487c0a/ryobi_10_inch_sliding_miter_saw_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6848d701-dcd5-490b-8be8-093228ccebee/is_twilight_midnight_sun_a_movie.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/el_bestiario_medieval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb89ecb-f8d3-4995-9339-717096d6ec64/ragujavurukirumufuxime.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/budget_2020_pakistan_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da10ad7-1818-4f5f-8dd5-cb058a68403d/sejuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723f582b-009c-4b41-b619-26d040288a63/jasuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529e69bc-b1dc-487b-9b4e-8ed4acb44522/how_do_i_find_out_how_old_my_browning_shotgun_is.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 5016 bytes
SHA-256: abb7ea1487abc164078ce2ddc334b3a2787689d5850185623c4f83934dc108d5
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 11256 bytes
SHA-256: ec4a5e978aae8563516c613ac2651c23bb4ac52fdd4a27a5538e2c60b19590c3

Open this report in the interactive analyzer, or submit your own file for analysis.