Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a77a622f7a188c…

MALICIOUS

PDF

70.2 KB Created: 2021-03-27 17:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 098e2dcc605df367aa2666f48487585b SHA-1: ca0a84b4ffd44d05f0228aeb0635e7b259e3421f SHA-256: c6a77a622f7a188c168e87c73a7f986fdb67053cb9738c77bf34837a8c0f4f5f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://xajibur.ru/award?keyword=anomalous+retinal+correspondence+pdf' and 'http://help-violation.com/how_to_write_an_instruction_manualmc3k6.pdf', suggest an attempt to redirect users to potentially harmful sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=anomalous+retinal+correspondence+pdf PDF link annotation
    • http://help-violation.com/how_to_write_an_instruction_manualmc3k6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5fdac4f7b8a62.pdfIn PDF document text
    • http://1green.space/8461156628sc3q8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600cf668b988d.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/sub_zero_642_water_filter_replacementsnmcx.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/q6gcBha/menenasofuliwobagaxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/jbnDEhc/31171228897.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/PifjacN/business_plan_definition.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/5304759809cjt1n.pdfIn PDF document text
    • http://vashobereg.com/dungeons_and_dragons_cartoon_episode_2gi9f3.pdfIn PDF document text
    • http://artyom.guru/14330401234dh5e0.pdfIn PDF document text
    • http://salea.site/parmak_fence_charger_wiring_diagramwtn3q.pdfIn PDF document text
    • http://mybestchan.online/6047454528627viv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fe9fa5114ab1.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/7a2eacc9-ac82-4fb2-a116-b67f5b93a689/98966362067.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/what_is_the_difference_between_flight_of_ideas_and_loose_associations.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/calculus_logarithmic_differentiation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b0c71c-e863-4d99-9a46-9c0aa464aff4/30_day_challenge_no_white_bread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4d7bfe-818b-4d6f-b85c-50a9aa9d828b/xigidedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec3da93-3bb7-41d4-81dd-306135abcec4/is_the_rules_of_magic_a_sequel.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_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 5288 bytes
SHA-256: 0954e4354593832bb59055432682665c879102f0179fbea90b35bb36c2709730
font_01_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 11044 bytes
SHA-256: fd6d44149ed14873a84eb62ff5abeccbc9cac69abbeb849ed580ed25dff36e91

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