Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b03a1e40c488da…

MALICIOUS

PDF

84.9 KB Created: 2021-03-24 21:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ddcb6e16d8fc8c1d2c6342b777e9bed5 SHA-1: 22ffcc9b8c2e90d62a03efe209851405a84406a1 SHA-256: d4b03a1e40c488da509d674b66694ae3f81332b4b1fc1c5d8f5433943bb77bac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=basic+electrical+engineering+vtu+notes+pdf+download PDF link annotation
    • http://gapijet.scienceontheweb.net/oxford_academic_english_dictionary.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/engineering_drawing_isometric_projection.pdfIn PDF document text
    • http://osmosiotzs.fun/candy_cat_rescue_bubble_shooter_unblockedi5hta.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/zutiwejakipetose.pdfIn PDF document text
    • https://cdn.sqhk.co/fokaladanolo/BkHhcT8/geometry_dash_world_pc.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/12706253237.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/94400030587.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/dhbgggf/80417610365.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/cultivo_puro_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/jajfzic/mr_love_queen_s_choice.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/jdhaDjg/how_to_cut_sound_clip_on_tiktok.pdfIn PDF document text
    • http://naxovigemelewe.iblogger.org/saxafudexogosowi.pdfIn PDF document text
    • http://secret-empire.ru/60109044640aehms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/is_acne_sign_of_hiv.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/base64_decode_to_file.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_85a57119978a4b9797323a4a48d3eeaa.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_1054392a626440498fb167ebc46f10a0.pdf?index=trueIn PDF document text
    • http://zodiripek.myartsonline.com/91784564591.pdfIn PDF document text
    • http://sosasofojatage.epizy.com/markstrat_report.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_3cbfb2ed2a194c07946ce723dce58188.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_6e85e1182b72440ca87f89a1a106866d.pdf?index=trueIn PDF document text
    • http://rofuvawitarul.atwebpages.com/alice_in_wonderland_disney_story.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_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 5524 bytes
SHA-256: 6f7c7beb04c33c7a0ccc6412ddc68d0577504ab7103d9c931c4be675a99bec25
font_01_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 11632 bytes
SHA-256: 7577bcdb71de33c175944858767dffa7865f53b64e744d620b0731a5f41fb4d3

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