Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e91db10a904a3ff…

MALICIOUS

PDF

73.5 KB Created: 2021-03-31 03:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcf905fce1f0e32a870c9bd5130f18fe SHA-1: b2f7dd2b274520c17c6eb983047c837399eed333 SHA-256: 4e91db10a904a3ffa7655a4701e0cbb0d86156b3621b94e73c69ab6e088e7ec0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains embedded URLs pointing to suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=royal+500+cash+register+manual PDF link annotation
    • http://wide-take.top/496465833773embb.pdfIn PDF document text
    • http://like-store.site/the_solstices_and_equinoxes_worksheekqlut.pdfIn PDF document text
    • http://creditreportus.info/pakaposaje5uo.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/drjahdi/occupational_therapy_vs_physical_therapy_assistant.pdfIn PDF document text
    • http://bubble1.space/12912611306tilg8.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/ja0jdMg/pezotade.pdfIn PDF document text
    • http://omerkatanalp.com/3513836760srrae.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/jHhifZh/marvel_super_heroes_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/ehgMgcn/war_artillery_tower_defense_extended.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/jogetarixazopaf.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/4188633.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/impuiaS/69641150773.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/ljgjeGj/sebutijamo.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/TGijfii/top_10_soccer_manager_games_for_android.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/579cdd6d-1ba4-4e78-90a1-9eee9ee9ee83/dosurorowofofe.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_bf85f0949dd84c35bd8048929ddaa61c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06b74e9-c34f-42a5-9b50-977e10a2b6ee/hoover_dual_power_max_pet_carpet_cleaner_w_antimicrobial_brushes_videos.pdfIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_d16c931496c5426f992622de91659d66.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_a92fc83d5dc14a43abf0181304835daa.pdf?index=trueIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_361917eb9ccd47fc9f948de7ebf39b4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d82739-a37a-46d7-8288-6b4f00696677/3861332340.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_3ac9759bf2d2460bbde3297c1a97283a.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_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 5588 bytes
SHA-256: 8f59ebec1899fc67a9e194c9cd92e3ff0f0141cd535dd9b53fabbb0dede8c0f6
font_01_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 10252 bytes
SHA-256: 9e68cb0dfb8b13a8f05fb5d90ed23a874db06f43c25366cbcb95512127a47b38

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