Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e85938108571eea…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 03:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b19b67c4098b2e057acf99fca2eb811b SHA-1: 6e938b83e11691093254de5d8c8df29f5dfa6c49 SHA-256: 1e85938108571eeaeacd2a0c0bb5c7135b0dfed8adcc5b78225c5003ac8fb0a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous disposable hosting domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rockbond-aac.com/id-admin/fckImages/file/40279262486.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e33b827deca598451c2c409e56b41170/lijuruxalowarapozagimuti.pdf
    • http://chi-kara.net/userfiles/file/togevofam.pdf
    • http://talentfuturesservices.com/sharpinstitute/images/files/26716559863.pdf
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/47526543545.pdf
    • http://jjc-dev.com/userfiles/file/22315042262.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceda8ad1d---15513395974.pdf
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/49915339919.pdf
    • https://akemi.ro/hirek/file/40618821139.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/25243243153.pdf
    • http://alrabbanoilandgas.com/file/files/kisosataxozupuxajiluzi.pdf
    • https://kuepancong.com/contents/files/kezasixaputomiwetok.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/88381516453.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/kuroxegabonejomopavebixo.pdf
    • http://cjpharmtech.com/upload/files/nuvuzok.pdf
    • http://coming-c.com/userfiles/file/82573288711.pdf
    • http://seattleteriyaki3.com/uploads/files/45844604829.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kunizajaxuzejivakadafit.pdf
    • https://rumusjitu.com/contents/files/74354420306.pdf
    • http://laureysnv.be/uploads/files/xibuserogu.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/mebadajakemoxepibowe.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/35117098090.pdf
    • http://techmechengineers.com/uploads/kolatiralutugezuridata.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+live+free+sports+streaming+sites
    • 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_off0000de2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
font_01_sfnt_off0000f643.bin
dd1a99034ae55960a532afd1124df0f2d71d1dda7fdf4ed4be6a93a57a6299b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 10820 bytes
font_02_sfnt_off00010f40.bin
2ea79d22f7c0f6cc89f00f7c1b72ea4e25156ff853e461facbe1cbe1340a7628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 17888 bytes

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