Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a91fd1abe885ff…

MALICIOUS

PDF

80.1 KB Created: 2021-04-10 22:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea9a8400d02a73b3fc647fdd36d11edb SHA-1: 70864d207a9235bab2771d40fc646c372e057aca SHA-256: f6a91fd1abe885ffacd6fbdbd10fa0497d071e9fc328029fbf20f41475a01098
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 0.9994

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://pelibifir.ru/strik?utm_term=how+to+use+yamaha+mg166cx PDF link annotation
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/fifonal-xenakus-bimekawu.pdfIn PDF document text
    • http://gedenidaxinexo.22web.org/ccrn_review_course.pdfIn PDF document text
    • http://supanigavig.iblogger.org/blumberg_forms_193.pdfIn PDF document text
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/sewifajumek-logepe-zozojulexi.pdfIn PDF document text
    • http://imedo.ru/stokes_equation_weak_formw19dh.pdfIn PDF document text
    • http://lonewawojelos.22web.org/attack_on_titan_tribute_game_feng.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/4735737.pdfIn PDF document text
    • https://subinekole.weebly.com/uploads/1/3/2/6/132695692/5697129.pdfIn PDF document text
    • https://vidijizuv.weebly.com/uploads/1/3/0/7/130776341/juwikawesu.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/t_fal_optigrill_customer_service.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/7bc2f1e4.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/modusenugagqdsk4.pdfIn PDF document text
    • http://parkji5x.xyz/69918846103uovu2.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/foxamew_ropuzubopanoziv_jibupaf_nososuguli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peguretunemidom.rf.gd/60036019055.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/48978717765.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/35548351265.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/rizidotuzitabajobolasu.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/26698702011.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/essential_oils_quick_reference_tool_8th_edition_2019_full_color.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/61404369647.pdfIn PDF document text
    • http://tufitokinetesez.rf.gd/why_causes_hip_pain.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_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 5512 bytes
SHA-256: beacd2d49125b78b21632f83c2f1b3deddd9299c9e18552a9851fe170c7946ca
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 10668 bytes
SHA-256: 607f2acbc48f01ceb488501a91c6288ef2b6a2b22f4dad36b3217f50c24a2df5

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