Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bf7d37f88451fa…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 02:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9641e304ed029e85595e52a72ae608bf SHA-1: ddb6f9acbbd806a0eee343308f9ff673cda0661d SHA-256: a0bf7d37f88451fa0df11d5b8675a329e8dc043843df9821348f88f62871ae30
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it presents a fake CAPTCHA or human verification prompt to the user, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://polskienarty.pl/data/aktualnosci_imgs/file/finoron.pdf In PDF document text
    • http://adveotec.com/img/file/44069014796.pdfIn PDF document text
    • http://bamor.org/userfiles/file/vurib.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/mizulisurowevigivaj.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/64252278508.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/21712722229.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/73308082625.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/bugukaxusemexefi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4bed8d855df4176adf335a9d2ffbc39/wejuxur.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/34845052086.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/58987445607.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/49664248418.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mojori.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/gobusakisegazige.pdfIn PDF document text
    • http://balalajka.nu/media/gumewilokabopuxabemusoka.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/75103520656.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd7b29244---40570116664.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jibimilejevipizabojuzojod.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/20826404013.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/32316090394.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/43380106755.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/59864535354.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/79441115496.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=truecaller+gold+apk+crackedPDF 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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 10384 bytes
SHA-256: 8246b5a36783575495f49ffeb0c80c3af5d61606fa428c18ed1d8f8da9999bcd
font_02_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 18544 bytes
SHA-256: 611c408f852be89ebed54fd6e15994fa01f0fb7ca465778564613f023f6a7fa1