Malicious PDF — malware analysis report

Static analysis result for SHA-256 b799e2fdbcce4b31…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 13:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 608308a737db8668af7f1078f9745d96 SHA-1: 0896d3d4100454118b9943639fa1d142da7b3234 SHA-256: b799e2fdbcce4b318a29e91e5fddd01d5cad4ce80087de83146706383d910d6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a probable phishing or malware distribution scheme. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=minecraft+pe+0.12+1+apk PDF link annotation
    • http://stagticket.com/fck_upload/file/jatowajefininesuduti.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/34758204649.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zobutatijujod.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tujikeduzojefajudan.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/59573179147.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/49981814422.pdfIn PDF document text
    • http://bscartridge.com/pic/lamimij.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/zazanizugem.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/babut.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/dipoge.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/ravepukewimiwedoxinur.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/musexadetuvanafo.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/10677172878.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/zutagubikigovirevapolatuf.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/7944258736.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/22677612050.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/mutaluw.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/vakikavagafewuvi.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/78946173191.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/fosimovidegulisavagade.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/59348019161.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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 10584 bytes
SHA-256: 4f18e5eebc33ba2d5d4a470d2a5c02914a14e5cb564b64093f39aafadd360b9b
font_01_sfnt_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 19084 bytes
SHA-256: 20b84fb0b95a27d46aec0f2b7f70cb36380abf678571eb826d79d726a2dfca8a

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