Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6a0f113baa4761…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 19:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 151d6ae8932dbd43c0ab421eff293e9d SHA-1: 708757b34590b1d17791fa19537132c19eb461a7 SHA-256: ff6a0f113baa4761d65fc2c239495bb6320c7df60f34f0c568a17a313b3e4084
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, one of which is associated with a potential phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://infrive.ru/uplcv?utm_term=android+game+coming+soon PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf63d895d---xamaketo.pdfIn PDF document text
    • https://edgecs.com/documents/kenod.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/wanarinozizajavuwulazef.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/jusid.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/benifekukuw.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090719500473499.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/fenivugumavudilokuziv.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/bivuwisigidepo.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xolatajakajaso.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45615491710.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/90903854388.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/bixen.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/45638328340.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/wugutekeginubizofafoguv.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/telizugijojejubenajerazal.pdfIn PDF document text
    • http://cocoal.com/uploads/file/62001850024.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/46371704665.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a54a7fc5---wikirujepixobixadoxone.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/lupajijuzawokuzakibinowu.pdfIn PDF document text
    • https://botroul.be/uploads/pasokesinagapuxofajugose.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/lalagumanixe.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sofunamunusegip.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/22618612244.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/37023621972.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/buwejiwuvegulere.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_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 10552 bytes
SHA-256: 992139e2b573ce8dd11e6a02253fefa78f34eff5781df208532f09b26841a297
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 17316 bytes
SHA-256: 6550ea207678c6119d0542dad1c131ebbf83ee2a0caca1df0f1c2f4a6774d548