Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b3a7f933ee44b0…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 21:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff34311973839464f9e62fb3530418ff SHA-1: eb70e93e46d4dea2b9f15041a6d87a9a633c9fbc SHA-256: 97b3a7f933ee44b0383f89ea16678cdae9bdb5b477fc7744ec4d3f05da8eb4e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=android+phone+makes+calls+on+its+own PDF link annotation
    • http://provia-events.de/pics/fotos/1/file/21112172208.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/zinerer.pdfIn PDF document text
    • http://poiskvod.ru/images/file/27320921279.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fe9216a9---3743464614.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nivebozomezijanoxunosez.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ff4a3034d3c38e3cf5728c187839e472/kalopinu.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/3379322105.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/piwilow.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/woviduf.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kanakejinusakone.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/90008276458.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/48084510422.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/xumezodatepubezipilif.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/foxunufavomekuwaserat.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/manuvitufod.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/motunibofesituw.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/wuvufevajedelibitupag.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090822574218997.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/nixenim.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/37268801705.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210907133803117.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/70505508052.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/budotogakiwasizitizuke.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/9340271620.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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10936 bytes
SHA-256: af1085537b8ae17473d8d6a1fa1a6baf7ba9efcdd59ff07188b0c2a2256c6e7d
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 17372 bytes
SHA-256: 39313ffb10bb31c9f4757980ba6651bb1d6feb71f6a3c537949600127fa4e322
font_02_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1