Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45931be13c895ef…

MALICIOUS

PDF

72.7 KB Created: 2021-06-06 08:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 18c7c0c8ae4757639fd8ed9ed52d5d0b SHA-1: 4172bfbd4cccb2ef80796843281f90fc8c61e519 SHA-256: c45931be13c895ef387674342fc481aab657708be7991d5c33ab76d5a068ce1d
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though partially obfuscated, suggests a lure related to 'how to use a micrometer screw gauge' which redirects to a suspicious URL. This pattern is consistent with phishing attempts designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/pbw?utm_term=how+to+use+a+micrometer+screw+gauge PDF link annotation
    • https://tebokatesax.weebly.com/uploads/1/3/3/9/133999418/jevulomonujupo-kumojano-besudisofavoser-vosuwujod.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470387/normal_60afe8e7e45d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5fe59b2f0a3f9.pdfIn PDF document text
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/bujidulazafokib.pdfIn PDF document text
    • https://luketekovagitor.weebly.com/uploads/1/3/4/2/134236109/7525697.pdfIn PDF document text
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/famaguvu-vopizofod.pdfIn PDF document text
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/paxekalude.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/300860f7-0c46-4c22-87dc-9709659a5643/corsair_k95_rgb_platinum_xt_cherry_mx_speed_qwerty.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416544/pl_sql_queries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bc895d-aae8-4ef8-83ca-b5ad891757bf/32147707634.pdfIn PDF document text
    • http://dodosuta.pbworks.com/f/moxarirutegevobetu.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/matousek_-_invitation_to_discrete_mathematics_solutions.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/how_to_connect_hp_officejet_8620_to_wifi.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144459261/me_divierto_y_aprendo_en_preescolar_3_cuaderno_de_trabajo.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/hp_probook_450_g5_battery.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/xexorusudapabogivelolixag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756a21d1-160b-47f5-ae78-fc2b35c28337/lumekadewaxubevokifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eee28b7-1d36-416c-94a9-bc4abb29048c/38668940155.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/34848399975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d8f989-cb7f-4e0e-903d-7242682f7e2d/89019111321.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/45206252935.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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 5140 bytes
SHA-256: 64d409258a384ca169c4c290fab2addbb656a4cbbf11e1c9b938e77ffa77f10b
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10276 bytes
SHA-256: 0a1e58c816e7039a86d20ef574006331df888e52a7a96d93dd6e03c8b405d814

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