Malicious PDF — malware analysis report

Static analysis result for SHA-256 f127ad871381ab2f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 19:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d00625169e9e5ab8c6aa5f3eefb0cf1 SHA-1: 3afbfcf786cbe32866402fd803188948e792ca2a SHA-256: f127ad871381ab2f7ebb4f48e3f7cdb24c480039a3fcbfe9da31f92791596749
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an SEO poisoning or phishing campaign. The presence of 'utm_term=ad+free+apk' in one URL hints at a potential lure for free software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thefarmatarapahoecounty.com/userimages/18944124436.pdf In PDF document text
    • http://mim2010.ru/userfiles/file/tujevimokesolotiju.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/16867414638.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/85902704918.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/43897771136.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/14090653355.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/suzogi.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021921398565.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/87437496685.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/45304389307.pdfIn PDF document text
    • https://eclearusa.com/images/file/xerawakikepizumibirapev.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/61951080361.pdfIn PDF document text
    • http://hadt.vn/upload/files/73106257641.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/68760110666.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_201252.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/masijudu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ddb42512---vamumaketu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/fesikuva.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/jitesarofamipuxitapotu.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/e60e6d050506a395b3bf58701f520694.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/doxevusakepinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ad+free+apkPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 17760 bytes
SHA-256: 96488f566956ad4c3a937eac06601bf6bb508aa23e382c5c322640da94f3d639
font_01_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 9936 bytes
SHA-256: dab89d4132340234150341ec4dbc99ad58c831354ea49eb59e08a6a2a0b0f7f8
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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