Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcbd1bf3a3aa5c5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 17:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d9e5bb024b88ee3d9c8fbb23d45a3f4 SHA-1: 7de436009354d282a4a6254865b2c8df632ad6f2 SHA-256: 0bcbd1bf3a3aa5c55303bac057176e1e712410101db5a1db15fffb2d3b8fe2ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish for information. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.tobywells.org/media/fckdir/file/11396773435.pdf In PDF document text
    • http://state-lithium.com/upload/files/74731342262.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gejimu.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/88708675802.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/2968064281.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/muvabidaloxoxodogekaj.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xagapajozopaf.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137781661197---96946401687.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/lojed.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090811353078.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/dojuwogufonu.pdfIn PDF document text
    • http://ukrfirework.com/images/file/saxaxinaxobumisupim.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jideviwiromoridebelo.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/fetitisaxijikanetosajele.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/ruzunoma.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/50683072889.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210907200331.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/26538353120.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/fupafufizajulavolarub.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/1142506487.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/bawiranidoguwepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=phantom+forces+esp+and+aimbotPDF 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_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 17288 bytes
SHA-256: 7e12f30d4231b4c83a9d65b2b504f588d7087da1eb8bab43d3518fc0985826f6
font_01_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 10980 bytes
SHA-256: 2c9d4b252602d772e8fa3282ed0bb12177955e59d226a299f4590fc0aec1128b

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