Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c01068431f0cfdd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 13:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a0eb9c6a5691cd06d488223eb8f0444 SHA-1: 99cf6d34b69afdb56db42ba39148826ac72ded16 SHA-256: 7c01068431f0cfdd84868d5e5d8509e66b2c23b11f0810a868b7fcc789b6d903
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. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm designed to redirect users to potentially unwanted software or phishing sites. The presence of multiple disposable hosting domains and UTM parameters further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=lightroom+mod+apk+new+version+download
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jevafexiduda.pdf
    • http://kingsfci.com/userfiles/file/serekamemowedikun.pdf
    • http://malopolskiszlakwinny.pl/upload/File/vukezinutawe.pdf
    • https://etadelloro.it/images/file/19289706823.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/31599516824.pdf
    • https://rintrans.com/files/6601264832.pdf
    • http://borik.customreal.sk/data/files/jajaxurogelubijojodu.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/24666236335.pdf
    • https://nbtele.com/en/cache/fck_files/file/55075712433.pdf
    • http://zatacorp.com/upload/files/34207960268.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dcca068d9---28871908586.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/ralezafoj.pdf
    • http://madmojo.com/fckupload/file/rorowuwusofakenewamisoro.pdf
    • https://nutrishop.in/ci/userfiles/files/basizarobojekunirar.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/sadafajeliparebelod.pdf
    • http://energy-labels.nl/userfiles/file/wilogaw.pdf
    • https://harkakotony.hu/UserFiles/file/lenatinoxojokiti.pdf
    • https://98ing.com/upload/ck/files/20210907_170006.pdf
    • http://fluorescent-training.com/file/35367243112.pdf
    • http://southerncross-ex.com/images/blog/file/nebelalorovemi.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/85244762280.pdf
    • https://lescourailleurs.com/upload/editor/file/fekikax.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/83674193024.pdf
    • https://lanegarrett.net/userfiles/file/24613695693.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_off0000dce4.bin
4bf1f7c8303c51863754d1f5228d85ce8d51f0b5108606db16def10eb23c9a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 11040 bytes
font_01_sfnt_off0000f63e.bin
24c73ad574720548b01a9ec3ae10dcadcc4f6ebc95a415639fb4b70133f75d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 17312 bytes
font_02_sfnt_off00012359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 16792 bytes

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