Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc2ba9eb6bb1e9c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 06:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d76a20ca36d23ccd7f1499194f14392 SHA-1: 528326996ddb8f7a98764683585d13ea34db862b SHA-256: acc2ba9eb6bb1e9cebe744bc15b4083431440eaba19799d0b4753f37fb48ffb5
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 on disposable hosting, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://wastran.ru/uplcv?utm_term=generator+mc+premium PDF link annotation
    • http://cinebuzz.be/uploads/userfiles/files/56182851663.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/xeweli.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/79876227477.pdfIn PDF document text
    • https://krusomying.com/data/file/keritagalewitupisibuto.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/womidivovedemupozeditoni.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/zakigesuzuveludixozebisiw.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109071521286100.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/rogefumunotivabotalevogaz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8eb316fab089760828f96d97d01018f9/fejasafogagezuxeminomabox.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/maxolezotegi.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/81402174114.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/10868591613.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/wozizifubepuvorupek.pdfIn PDF document text
    • http://charontrade.hu/data/file/71210064824.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/zuribosezawawogapudirener.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/ravujebisu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/zowenujasuxevawo.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/35912212299.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/86384295644.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96228218515.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/25823363001.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/waberadetevumisarukuwipuf.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/sibog.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/sajesu.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/wesenaretupeban.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lomovafitetinulerofopoja.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_off0000b8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F4 10460 bytes
SHA-256: 1f00bf14a2120577ddb39fc6488a9b276c07f6cbae698a7bdc6ff5a90a52f483
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 17360 bytes
SHA-256: 91f5353ae4da25b718cbe096d6f5bbcc67e5f9bf1a391d9385a71d976a1f776e
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1