Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abbe7add7ef798c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 07:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ab6fe0b50de56e0ef6c8ed627f858fc SHA-1: 77426751fe7563eba32f59f13ab12cd2f497e942 SHA-256: 8abbe7add7ef798c1aeddedf0e19411ff1917caa8f60a082fd25585010222174
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://invismortgagebroker.com/images/file/80274060712.pdf
    • http://xhiehchin.com/Xhieh_News/_file/jebagunot.pdf
    • http://happyhanool.com/ckupload/files/dojesidokopozojaje.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/56424298189.pdf
    • http://sungwoo-n.com/userfiles/file/44124530279.pdf
    • https://bwhe.in/ckfinder/userfiles/files/89948785797.pdf
    • https://ww150005.linebot.net/upfile/files/20210914053600.pdf
    • http://primethailand.com/ckfinder/userfiles/files/9205617195.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/bipumovokesozud.pdf
    • http://chukgoobok.com/files/fckeditor/file/20860009377.pdf
    • https://sieuthimaycafe.vn/uploads/file/lirezokijebudur.pdf
    • http://spartapr.com/images/upload/file/5421476964.pdf
    • http://shoreluxurylimos.com/userfiles/files/78480839617.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dimofaresan.pdf
    • https://alwaysthesame.pt/site/upload/file/tuxadupopopepufukujidin.pdf
    • http://footstepfloor.com/upfiles/files/79516348322.pdf
    • http://iburgisidimarsala.eu/userfiles/files/51811318287.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaad534cf---45532242344.pdf
    • https://giga-tronics.com/userfiles/files/jusonamiz.pdf
    • http://studionegro.net/userfiles/files/lezizikujelawu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614007d4b9b29---dokepeduwepiderowuvuba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+language+to+learn+for+android+development
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nidesavolesarox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 16792 bytes
font_01_sfnt_off0000e27c.bin
93cc1ac53457791c646fd3b9f735464daebe98c0f4eb96b866f6850514e242ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 11060 bytes
font_02_sfnt_off0000fc10.bin
7f69c0b669c9070ba5bdf885a11c5522376e67cecd43590b03bf1fcf66891091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 17648 bytes

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