Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a5d198dd292653…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 02:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5c37a26df2037777b0b1af6f2e8eced SHA-1: e8d897174251d4805ee9afe6fd8eb4bd86001998 SHA-256: a5a5d198dd2926530adad63ec953786c086758de7a1914b40fd45cf088c546e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and is structured as a link farm, indicating a probable phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nomylo.ru/uplcv?utm_term=simply+prepaid+unlimited PDF link annotation
    • https://rosanaalvarracin.com/userfiles/file/donowopodefokonosaz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/ketuxusamemufoxuvebuv.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/potatagokavigupemikape.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/gapivuvekepumaxogivirite.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lulenivunurevejinude.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210907062321_fdefag.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/63962858311.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/71237204573.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143779db55ec---bomiloxanovibenixir.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3f94880bf3c1ccefe2932d8ec5a457bd/70020123232.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/7860537843.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/43496018224.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/lavefadipuxalu.pdfIn PDF document text
    • http://parateam.cz/file/gojigemumiwodazumi.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/31617538090.pdfIn PDF document text
    • http://renknh.com/ckupload/files/mepidifupuvezinawakojovi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/vefebip.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/vekuji.pdfIn PDF document text
    • http://i-physiology.ru/upload/rebosakide.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/ponugegivobimitazobipiso.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/zabalakefoduj.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/59855342514.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rurizariluze.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210904131810_kb2ms0.pdfIn PDF document text
    • 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 17360 bytes
SHA-256: ffaed139cda095637e9a3c6449ab8ea6df649ec352b60b235bff70de6ac904f8
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10552 bytes
SHA-256: 863b6e0ab0758623e979ec53ea1910443940ff0261726fa656417fd2dea763a7

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