Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f8970ae75caff9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bde395f1499a4771a61e64ce2d869d84 SHA-1: 58c4e39ebb405808af9e6a8b4c75636c903dd02b SHA-256: a1f8970ae75caff9decfd250f9f019048f03c045026477cabdde7104abf67849
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest a link farm or SEO manipulation tactic, potentially leading to further malicious downloads or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

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 http://bumsnab.ru/uploads/files/jibabesozit.pdf In PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/xaperavolobudozamufis.pdfIn PDF document text
    • http://parilka.by/var/upload/file/23423866360.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nozijibumapidebizewog.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fajigilogemadoronul.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/42132609784.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/54606246278.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/1791866550.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/mixuvawezej.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/28263040844.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/duwifeb.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/xoxumenife.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tabixonufu.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/xakapupakarejube.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/14579325710.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137b56da9a9d---29855110421.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/ruvuduxedozapoluxumafove.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/51724040196.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/76900193794.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fodetaw.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zodulokajukikaropaxuzasod.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/11056291480.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea42469872---sulojupizejixovos.pdfIn PDF document text
    • http://deforma.it/userfiles/files/dederisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+hidden+settingsPDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 19300 bytes
SHA-256: c309bbb30e8c773b53a73d4576b07e241ec57558569046b0b50c95fb583e1feb
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 10300 bytes
SHA-256: d226e9b73455b402f9b8ae07906a70996c72a5ee520ed339d877ae65cbde121c