Malicious PDF — malware analysis report

Static analysis result for SHA-256 6360fa5cba691403…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 14:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a05ed8e6be5495b102b08917b4e75dcd SHA-1: 29c476445ab6ac2240cd244ea44b9552e140621e SHA-256: 6360fa5cba6914034236845d01684a8884a8aef75f5c1cbae43e80050b249943
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://retailpark.bg/uploads/wysiwyg/files/87651601768.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/91483605763.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/91444825804.pdfIn PDF document text
    • https://proxus.nl/file/39621154732.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/42397202941.pdfIn PDF document text
    • http://ccadl.com/files/20210908130144.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210906022242_d8glgu.pdfIn PDF document text
    • http://dominant.name/userfiles/file/kizimeripapejijikebepo.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210907102727.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/divox.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/60487663027.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/lowomiwuj.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/70636061640.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/72060444649.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/zevalurejabefanu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec61da1a97---wunabajupinewanena.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/golalowoguna.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/39740695310.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/sosewanojumok.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10b5bfa70---79197046225.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/332543952.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/fiperagajexiwatuvofokumub.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/9100057235.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_B5C34033A6EFDB79.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210903201407.pdfIn PDF document text
    • https://beautydent.hu/editor_up/43347660787.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vefew.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/88359754819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=outlook+android+exchange+activesyncPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 11148 bytes
SHA-256: c045f681845510ca313d8de9a3751719665eec401c5f4cf3e6e8236ab4923c82
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 17400 bytes
SHA-256: 3f39b850c98a05bcf2ecd32a40798ae91d196c78f6a2ced551699c57145c298b