Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81e762a2d0eaa42…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 13:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48a2684815010c822e9b3aa7f4729b70 SHA-1: 538e9c097a477064db1f22d9e2afc4ad160434cf SHA-256: d81e762a2d0eaa42dcddf855f6202952050408024d06218a420c50b21ffc0439
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm and contains a fake download button and callback lure, suggesting a phishing or scam attempt. Multiple external URIs were extracted, pointing to potential download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=pokemon+let%27s+go+pikachu+gba+in+english PDF link annotation
    • http://aptekainternetowa.net/_mdm_apteki/file/bojimususopa.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/79664490475.pdfIn PDF document text
    • https://iohrp.org/f_files/files/21056687198.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/zutaxo.pdfIn PDF document text
    • http://gabortech.com/admin/file/kafuponupafolif.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/tamexagitupekolilusugo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/julajet.pdfIn PDF document text
    • http://ctm.it/userfiles/file/23989703606.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/14050973111.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210919162625.pdfIn PDF document text
    • https://hinaweb.com/upload/file/pitefekot.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/69573014018.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/10420151615.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/20026099103.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/34145257113.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/mutavagal.pdfIn PDF document text
    • http://ubest.ru/images/file/gaxeretamabik.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/14610402185.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/lepotazu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210916165416.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6750a36a5---94682141899.pdfIn PDF document text
    • http://zeci.nl/im/image/mibetagipezetonamelunogow.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/fopevo.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 21604 bytes
SHA-256: 1181ebf13b533ee34f04477788b1d8bd7a8313a8f130af6069730713b7d48817
font_01_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 11088 bytes
SHA-256: 20b7bb694219b8c55ca57e9a25e7c6b8cc5c35b7b64fbe242c2b99918924be26