Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bcf5c5d833dff9…

MALICIOUS

PDF

80.7 KB Created: 2021-04-23 23:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a8fabff3e99f02fc417aff03dac2916c SHA-1: b80da3d394d1e6d43aef945d7f62feb53538f7d3 SHA-256: 76bcf5c5d833dff9f4ddba7c29e155e88c8abc1ed29d2a0890eb6694ba5fdfba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=what+is+the+latest+version+of+amazon+kindle+fire PDF link annotation
    • http://microdigitalmeter.xyz/libro_libertad_financiera54zpw.pdfIn PDF document text
    • http://wildboost.club/unlock_icloud_activation_lock_freekhg33.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/fttIShi/heart_anatomy_appendage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_600745e3161a4.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/hdgigcR/sasusewuwupuxelor.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/Ric9jb5/piwupofatokotovem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5ff8a81873ca0.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/jdjgibs/ice_cream_maker_amazon_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ahfrJii/xodagixaweka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e143b1b3a40b4aa78e1fea7b0e59b3cc.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_4d778362cd8d4b94b655a9d3f7f67800.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/pejaxixosekulukonape.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_002fe7efd3d4471d8b5c6aace42cda7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/the_go-giver_5_laws.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_78f3c053512b478f80ea280de789426d.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_4bb9b6fba74a4903ae61b6e496eb9add.pdf?index=trueIn PDF document text
    • http://wikosupiz.epizy.com/example_of_a_short_biography_of_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/acrylic_sheet_manufacturer_in_kolkata.pdfIn PDF document text
    • http://kurejaj.epizy.com/how_old_is_rainsford_in_the_most_dangerous_game.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_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 5332 bytes
SHA-256: 89692ec37488777bc9ebb5d147e7d03877b5a3fc7bf84012e661c2351e288c6b
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 11024 bytes
SHA-256: 3715245670d5657cc052817e7a67a9db7f1a1fad6b040e096077e4fa83212c21

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