Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e2b822760d53a0…

MALICIOUS

PDF

69.1 KB Created: 2021-10-06 08:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 143e461860f394dff5d2a97699ab9ad4 SHA-1: c57cd3207e0871d903309780a1844b2887093eb7 SHA-256: 01e2b822760d53a00b895f015b863617a88570d57206fcfe2a045cb3bee76c25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic used for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves redirecting users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://esterkins.de/ckfinder/userfiles/files/44796653599.pdf In PDF document text
    • http://harekatmemuru.com/images/Media/files/vebazoseverixal.pdfIn PDF document text
    • https://baglab.pl/galeria/file/16417637481.pdfIn PDF document text
    • https://riwg.in/userfiles/file/53043115465.pdfIn PDF document text
    • http://ridendo.cz/files/file/98531272717.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/refawuvezol.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/gorutobol.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/93411764822.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/xedejelekikefor.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/tunewo.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/99870951330.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/lofuw.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/18198173493.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/51079005020.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/36214490489.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/kaxanaligufufiwew.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/gidofixajilur.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109130419381923.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/14762634778.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/paduzemofewupudotur.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8f7c38aceb745925b3bb12a7eb12d0ae/80027832846.pdfIn PDF document text
    • https://obrbikes.com/files/files/50296711683.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/52129852038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=closest+taxi+near+mePDF 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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 15412 bytes
SHA-256: 32152b90ffc5288d8879736a033abd89648ba9d6a102d3e924f38dcbfc577060
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 10404 bytes
SHA-256: b656c45d0dd900495e10f2002c99887f59fcfabdee73b12e9d2db48110b3383c
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1