Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a149d2ac51ca6f…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 20:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae887322b863e4b702f5c2b2826d3319 SHA-1: 7fa524de2874990a0bdd660107738daaed711c7d SHA-256: b0a149d2ac51ca6f4272021e890d4c2d457f27db2a346ac472760cf0318c0c3e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eo195tclt1jc610njc46gbjn5e/37037264568.pdf In PDF document text
    • http://studiocalcinoni.com/userfiles/files/kukejunemos.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/40469459814.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/kuxujonirupilamateri.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rugemogage.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/42969288824.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/pevasibuz.pdfIn PDF document text
    • http://esistore.com/userfiles/file/20285177313.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/jubawirivemijexonezo.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210917164423.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/vupajigapijifonul.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.pdfIn PDF document text
    • http://asqcert.net/files/files/lukinuvafiwen.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109121520513752.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/pasel.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/jijoz.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/47112851276.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/rediwuzetunuponolur.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/xarikobumololojifomu.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/zugit.pdfIn PDF document text
    • http://anninh247.info/upload/files/zereb.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/82665565645.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/98786956541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=christmas+time+is+here+piano+sheet+music+pdf+freePDF 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_off0000ad62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 15856 bytes
SHA-256: 625d1a611904650289145df6b415897f0ace6a8d64fcf8d194bc94e93a4ac342
font_02_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 10972 bytes
SHA-256: a99bd0938015c56049563cdadfd7981e98ac534e9b67fd61a9f3b91c03115519

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