Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b25973fc445e6b6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 04:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d4248283cb82947de8cedf9b5393627 SHA-1: 980cda1224c1e13bf4053fe380606644096f6133 SHA-256: 5b25973fc445e6b6c6034fea15c7d5d0f93a355be0a68931a7e8ee25d71ff605
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs pointing to link farms on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yunglin.com/uploadpic/files/2077675193.pdf
    • https://angelsforwarriors.org/userfiles/files/93386531269.pdf
    • http://net-marketing.hu/images/files/jikej.pdf
    • https://smartcirclegroup.com/userfiles/file/zedorigow.pdf
    • https://distriparkbotlek.nl/userfiles/files/vevek.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/63895854917.pdf
    • http://botaierpharm.com/upload/files/wivifesovolatus.pdf
    • http://kiddeefire.com/media/userfiles/files/lolawofisonokozoto.pdf
    • https://tomorrowhubs.com/upload/users/files/jidukowozexawazobefubus.pdf
    • https://losungversorger.com/product/file/bikuzuremevixumumotaga.pdf
    • http://clarksville.net/wysiwygfiles/file/vudetovasopukaxebemik.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/72420108737.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musuvewupu.pdf
    • http://gold-carsales.com/js/upload/files/rekipavuwo.pdf
    • http://vidiniaibreketai.lt/userfiles/file/xalasivilawatubasaro.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04150398---17437794362.pdf
    • http://twtipa.com/upfile/files/2021/09/06/6477874095.pdf
    • http://forma8.kz/ckfinder/userfiles/files/19225504527.pdf
    • https://tekartltd.com/upload/files/pexoselotowemigizovowegi.pdf
    • https://businesslife.com/content/files/3399673844.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/45520957834.pdf
    • https://dongphuchuytai.com/upload/files/zigus.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/71788218676.pdf
    • http://hagelkonzept.com/userfiles/file/guxitunakugomarad.pdf
    • http://balade-pierry.fr/userfiles/file/64698686925.pdf
    • https://eyetracking.pl/userfiles/file/zitofujazima.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+android+system+upgrade
    • 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_off0000d8fa.bin
df76557d27e0db0c53aa7ed68f88f8699b1752201fc17006d35823249160dd20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 10880 bytes
font_01_sfnt_off0000f1e4.bin
b6a4bbc08ff7767b9c28fe96b4f6e6c0c9bb9c159a81e51c90b09b99d17d6d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 17360 bytes
font_02_sfnt_off00011f16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes

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