Malicious PDF — malware analysis report

Static analysis result for SHA-256 3727c6748cfb976f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 00:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6aa594093eac56201157a4ae0222e568 SHA-1: f3e2f1e16a033501bcef500bb1c7be6f17727081 SHA-256: 3727c6748cfb976fb8a55234f2401b112ce8e4aaa8d7cb70c2be8d0c3acb96d7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is hosted on disposable domains, characteristic of a link farm used to distribute malware. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document body contains sequences that could be interpreted as commands, potentially for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/award?keyword=bank+po+english+book+pdf PDF link annotation
    • http://vevufilusik.scienceontheweb.net/96797044544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_6002f16c036f0.pdfIn PDF document text
    • http://profit-makers.club/petsafe_replacement_collar_for_wireless_fence4fix2.pdfIn PDF document text
    • http://dvestideyli.xyz/mebesimixugosapehl8jt.pdfIn PDF document text
    • https://cdn.sqhk.co/sibonawumup/alsOjjd/86378355571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475216/normal_5fea00b723d75.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/jatedube-zusejupudubokik.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/how_to_do_wave_curls_on_short_hair8nj5n.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/left_heart_catheterization.pdfIn PDF document text
    • http://dress-russia.ru/newil3k5f4.pdfIn macro / runtime command snippet
    • http://ebay-coupon.ru/renet0lx35.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/nunologen/ojhejj2/xopik.pdfIn macro / runtime command snippet
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/6748892.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/hghdidb/67892035834.pdfIn PDF document text
    • http://sakaxek.mygamesonline.orIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexefobixavater.myartsonline.com/how_to_calculate_volume_in_liters_from_inches.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/checkpoint_capsule_vpn_apk.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/how_to_get_the_area_of_an_isosceles_trapezoid.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/2998337065.pdfIn PDF document text
    • http://pizenusogusu.atwebpages.com/51453545786.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/acdsee_pro_8_free.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_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 5460 bytes
SHA-256: eaca4f24e67d7c0fdfbef0f2e00a88ce07bd29f0e0514f1c6a8cd2ac85b1639a
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 11104 bytes
SHA-256: bae9c069402e4e5bbac5d744d155fc57cceb4d3e342cd564ed235364f75064c8

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