Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cea8fa581f12ac…

MALICIOUS

PDF

88.3 KB Created: 2021-10-05 12:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 198779bde3d7fc75d2ce12a4b1565290 SHA-1: 6371f1b4a68d5773bebeb815e6a00fc542191452 SHA-256: e5cea8fa581f12ac06eead9a25353978aae3408bdc8b0cce2e74830b1cb7a15e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with numerous embedded URLs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to external sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=where+to+harvest+wood+elf+blood PDF link annotation
    • https://bruceautoservice.com/files/file/madibamefigazero.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/radonox.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148120cccf7a---23104449470.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/dulikerabagosejiwor.pdfIn PDF document text
    • https://funbugs.ie/files/file/50344193985.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/87289548968.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/43041590317.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20211002024211.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/17289215430.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/zidimolumigibuguxerujoziw.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/032120441410.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/11456168147.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/xulinikiniwut.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/76326593309.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/92474350897.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/ruvemiropuxaxoroxevutotej.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/80687878076.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/959445089.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nekoxeraradoxinegovav.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gapuferebasi.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/gesujenosa.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/vaxaridatuwovegobat.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/62242542759.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210916020435.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://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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 20544 bytes
SHA-256: f6584c4d2046ceead970b861ba157c186156a5cb1bc91311ae372f9231f42210
font_01_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B21 10540 bytes
SHA-256: 52bfc83306db89fd2c8bfeeb28000d5b8b36a80acfe39383fadae816c70776b6