Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3a7a441e60d4e7…

MALICIOUS

PDF

66.7 KB Created: 2021-10-03 09:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1aa2922b9142ff7d7d2dbfc56640f2af SHA-1: 64dedf0bc179fb91fc53cdf05d82d03ff552d27c SHA-256: de3a7a441e60d4e7a82e7d36e8c9795683401fc82b40edc6e2b00c389c6c7109
186 Risk Score

Malware Insights

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

The PDF employs a common phishing tactic by presenting itself as an image to entice user interaction. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://burragebrothers.com/demo/jolie/beta/userfiles/files/lovatizukomikofoda.pdf In PDF document text
    • https://mccartha-cobb.com/userfiles/files/delotonozisowagogomikirak.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/68265817299.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/93988062339.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///60852167948.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/81994154999.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/11110171769.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/36413024598.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/98589857516.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/subifezoraserer.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/nesegurovamemodi.pdfIn PDF document text
    • https://wasael.com/userfiles/file/28182007643.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/43912712912.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hbepekudso7qga71p6rem2q1i5/31051814978.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d28ed8a977de9bb5c9c19aa4d06071a9/83191112292.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915181057.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/76610572889.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/soniravar.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/67440956976.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/31134329074.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/nokosepubifipirozepus.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/majogekawinufulamutuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=heat+wave+in+the+westPDF 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_off0000acbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBC 14028 bytes
SHA-256: 4eafce6be37ea0d5269066ee0eec10de480cce768fa2568ba390f92742576c89
font_01_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 10084 bytes
SHA-256: 0a2ea461206617624f4b7304fe01941e1c4c076479c37d4dcf6e6c9c4f0c1658
font_02_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1