Malicious PDF — malware analysis report

Static analysis result for SHA-256 4089fa5c381b58e5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 09:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c810ae2f6b36cb32ffda3fffcdfc18e9 SHA-1: 81465ee86b0f6d2d55b72bf0e3d06e0e7aeb20c4 SHA-256: 4089fa5c381b58e5645f3ac563fa5ac5aac810d048c168eb361385043c077761
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting an attempt to direct users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://logtech.cz/foto/Image/file/69587507777.pdf In PDF document text
    • https://pasifikendustriyel.com/userfiles/file/45849984706.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/10902553205.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/sepili.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/67594978781.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/54762354267.pdfIn PDF document text
    • http://viettincapital.vn/upload/files/68433323306.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/29974648076.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/20080983384.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/xuresikapajorulorituvuk.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/ruvowabewim.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/damikuzi.pdfIn PDF document text
    • http://strandedtattoo.info/file/64009092931.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fevapewove.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/64528772416.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b477b0bf4020e5ff68d2c78374334141/ketukoratoraxuvekudow.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/xasologad.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c11cfcf5b5---8440102638.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/50196416425.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/kubosajalasufotofud.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/86142482030.pdfIn PDF document text
    • https://trexanh.net/upload/files/93056903044.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/gufadike.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/gifisugogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=enable+ipv6+on+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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 10476 bytes
SHA-256: 3c674e4553cf15a37e7ef77532462d55e9a09e0cb736e1e517f56c64f895bb96
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 18340 bytes
SHA-256: 24c7740a2913f0f07dc160c418c7acbdcf507f3f0050195b0bb8e8057ac063d8

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