Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3212df20711d58…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 08:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 044113cbf0a41ef0b63df81bb24b6b8a SHA-1: fb80b6fda67e73df246f98c22e4f33791ac06b64 SHA-256: 9b3212df20711d585ab757b1896b0283fcd924d572e8333594feb19c3cb9e335
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it is a phishing lure designed to trick users into calling a phone number. While no scripts were directly extracted, the PDF structure and external URI findings suggest it may leverage embedded JavaScript for malicious actions, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.mbk-montage.nl/ckfinder/userfiles/files/zojofatekumojuvajalorikal.pdf In PDF document text
    • https://anukulagrotech.com/userfiles/file/dufuzubonuxuwulofaz.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/81441042354.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021100202442066702.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/29789964678.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/34472664141.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/41227382496.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/2718856352.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/535273277.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef2869007---koredasinidulavefekupela.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tumefaxerubepasa.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/rinupopiginu.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/88987821621.pdfIn PDF document text
    • https://almavilag.hu/files/files/nasuwavowafu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fufenugorikilulitesenig.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8fb3bc87c---waladutagil.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/13053893904.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/tuwegogamovumap.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/12894255065.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/botutesubekoxeviriwuw.pdfIn PDF document text
    • http://haphadoor.com/upload/files/zoruzeseruretazifadimeno.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901191329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=parasite+in+human+mouthPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/44332272065.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_off0000aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70E 15568 bytes
SHA-256: 14a1a80d7a4ab70714abf00c124d4be130b54b6884845bf4fe6331c42ff7f784
font_02_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10428 bytes
SHA-256: 99274885be5af3fe1070a362dae51cf83a11703df67230f7b9a200b353998e47