Malicious PDF — malware analysis report

Static analysis result for SHA-256 110658d708241634…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 03:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a857d782dfb51cb0a02e6129c5a6a10a SHA-1: badf63ab9c951fe61115c4096c2e3ced30c1382a SHA-256: 110658d708241634955f4af2bd1b27046fc53cb837ab02ad787fff71cdfbd5f9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. Heuristics indicate it functions as a link farm and employs a callback lure, prompting users to contact a number for fraudulent purposes. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://intertexmedical.com/userfiles/files/59745895785.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/73697454809.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/82988491965.pdfIn PDF document text
    • http://jarosi.hu/files/file/vemekozutedulij.pdfIn PDF document text
    • http://snft.ro/media/file/ruresujeluvuriwafugaroluw.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/93535445141.pdfIn PDF document text
    • http://prompol.com/media/file/19559061748.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/29159033664.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/53471910370.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kogirifikarawi.pdfIn PDF document text
    • http://jsdarvin.com/files/43606983877.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162d83c4f3---zekekel.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130920253ea7---81376451499.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/71653584829.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/18872152415.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/pozigul.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/zipovupi.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/40375777014.pdfIn PDF document text
    • https://questyme.com/userfiles/file/30854295.pdfIn PDF document text
    • https://toocapen.com/files/sekilizuxarov.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/nabajunevelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+tema+sharingan+for+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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 10888 bytes
SHA-256: 4d402f279c5d9f0f437e55447dd1a8c1b864ac1bebd076fe269ffba448fdb576
font_02_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 17592 bytes
SHA-256: 30b0b68af5e21fe90d315c69615c323d4524977563d841c35f94a5345fa7286b

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