Malicious PDF — malware analysis report

Static analysis result for SHA-256 580fef464d7ab6fc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 18:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be9bbb6d2e4590a288eef375416d02c1 SHA-1: a7868d4c1ddef02dc26a913511c3796418beff3a SHA-256: 580fef464d7ab6fc69389a5a07d27825adf13c33e2ed384e5cdf0b89e24bb61f
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://donghobaoan.com/uploads/files/gosuronotijur.pdf In PDF document text
    • http://vkts.se/userfiles/file/geseminokadanivik.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/siwapopuwogebaxuzijowefux.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/11018421909.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/webobutadi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbca51ff6---xikikixopafit.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/45511269041.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/50864604310.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/68339573701.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/76406686089.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109021433519965.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/wagapu.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/34337724343.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/14392863222.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/27384247153.pdfIn PDF document text
    • http://wjcopy.com/upload/files/52045959792.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/42609164905.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/ramokawujejokoma.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52097575721.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/14743469885.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/varepagib.pdfIn PDF document text
    • https://matratva.in/userfiles/file/79795992577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+print+text+messages+from+androidPDF 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_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 17920 bytes
SHA-256: b6ef0b12eba39afbf702972b58f767575865747ae4f7dc29b4b4d194f60beb2a
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 11140 bytes
SHA-256: 4fd112e7a2fbe71446a1b09eb8faaa7dea17c22b7f129038a42e6b871c932858

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