Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c339da4688c27f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 07:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30e0ae2a414377c67eeb99bc522f4652 SHA-1: 34e6ccf6af31589a25952e2c1e83b9ece4725d7a SHA-256: b7c339da4688c27fefb75e033154de4834b84f1c3ece51cfc91f2e59e59bea04
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or services. The presence of numerous unknown URLs points to a potential phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://ecohouse-lab.de/userfiles/file/3037094676.pdf In PDF document text
    • http://iknow.pl/files/file/luwarat.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/10749406557.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/10402883094.pdfIn PDF document text
    • http://chongros.com/userData/board/file/xofifimaganuvarejovixen.pdfIn PDF document text
    • http://sb-78.ru/files/file/tosipogakominifazunovo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9fc9c4a637b5bf6eba32de796f0eb22a/67786876553.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/lizofatevopigigojuzax.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/6705299842.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/21023131804.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/pivaxelevavetam.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/74750521333.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///dulamusadalifafevudat.pdfIn PDF document text
    • http://hijoin.hu/editor_up/mujixolugo.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/66529074642.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/mikusanijovurufovekux.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///84889836796.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/62994160400.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/68428844019.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7abf4260076682d7016ffaca7484fd8b/66270438893.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vaninuxiwodifa.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/migujovixunidedenavavelut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=check+android+ramPDF 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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 19832 bytes
SHA-256: 25c4975832fdf9fc069d4ca2bc9b812cea9ebb4d6fe9a721223ea1060426054c
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 10448 bytes
SHA-256: 1a04d6cd209569d551eb7b3c1caf052c242b412703f2c2cdec66f499e82b9da0

Open this report in the interactive analyzer, or submit your own file for analysis.