Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa16c5c26aa45c7…

MALICIOUS

PDF

78.3 KB Created: 2021-10-04 20:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b31aa5aa2d2f92422445bb40f4eb5dbf SHA-1: 0322eb0ef1380c9fd2f54283ab19e45a33061e44 SHA-256: bfa16c5c26aa45c79828d3416693c09e5a7cf80fbe2743e6693d29d1e96e9c63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to a large number of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nhasachconggiao.com/luutru/files/43469628714.pdf In PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/73985195878.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/8926953397.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/49001276319.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/mibemidefaniwegug.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/39444473295.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/jufeses.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/15087446720.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/37445102244.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/fivekerupus.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/24836329037.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dafinolawatigamebexa.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/39334799032.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/20960241977.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/71209753241.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6so1fe7lrk0jveiao8jdi1d20r/59063780422.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kopadepizabutesokab.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///59249328270.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/27801794509.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/54323756222.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/97457210878.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kiwurudezi.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/34293317075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=i+would+be+your+hero+babyPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/87840381667.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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 10276 bytes
SHA-256: fcfab952084f3b72254dc8d7c5c9cbbf2d23a47a869605bdda088e8b14ae433c
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 17092 bytes
SHA-256: 9015ddad02c176977a09a7e7440ce4f7ea4e1d47ea56f1fd0e2c5ddf4c81a1cf
font_02_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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