Malicious PDF — malware analysis report

Static analysis result for SHA-256 72055ea76c12385c…

MALICIOUS

PDF

75.9 KB Created: 2021-01-17 03:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 740371b93526ea52374e77e3c1dafd77 SHA-1: c0fbf70539fee321095f21e2092b59cc07f14693 SHA-256: 72055ea76c12385c01eec58d8febedd61910bea824773dbccd7022ef4ce9bb34
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'traffset.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=adobe+animate+cc+2018+portable PDF link annotation
    • https://tedibijufu.weebly.com/uploads/1/3/4/6/134678634/nosimek-nebegijew.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/Qjhgdic/wobit.pdfIn PDF document text
    • https://site-1176701.mozfiles.com/files/1176701/father_and_son_cat_stevens_song.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/hhiaigL/world_history_textbook_10th_grade_holt_mcdougal.pdfIn PDF document text
    • https://site-1229354.mozfiles.com/files/1229354/burp_suite_pro_cracked_version.pdfIn PDF document text
    • https://site-1177636.mozfiles.com/files/1177636/96545127290.pdfIn PDF document text
    • https://peromukagitogim.weebly.com/uploads/1/3/1/3/131383820/3bc49.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ge6ghuy/60279517989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_5f9e5a3c83d59.pdfIn PDF document text
    • https://site-1172684.mozfiles.com/files/1172684/brighton_veteran_car_run_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/betefowubevat/61294559124.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/sony_wi-_c300_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/tekodefusefi.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/juvuniwawipelejerajebafu.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/tuxabiwopuzuzixim.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 2980 bytes
SHA-256: 5d44f490efa38564332ac28490846ee63ad85d8f6f70389d9853df3232bb1a0b
font_01_sfnt_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 5480 bytes
SHA-256: 69b6e36bac6ea1bda3f4f60aff5b99284511ad5ddb5de09aa050730233a165f7
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10948 bytes
SHA-256: a62813e7df52367b6befa9010ad899d46a61983624270eb0b524020386d73433
font_03_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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