Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe681bc7b95db12…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 04:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b0ddedb9ee2ff88c120adf540c3b449 SHA-1: 03f4ad127b78e73bce45e2d52be66ecad53344b0 SHA-256: afe681bc7b95db120b7de7e59bb736001151aa139ddbf9d6143ae566ac0d5556
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fine-trading-knotwork.com/uploads/media/semisesadevilega.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/newisusisumuluwarigifewij.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/84097287563.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/ririzegugakavudidupumitix.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/lonefep.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/buxozama.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/pufojete.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2c0c08e2402532ad6c7c4e24c38930e7/22846662969.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/52376645547.pdfIn PDF document text
    • https://andana.us/files/files/donolomulofogu.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/5925097750.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/8920672972.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/78796806564.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/tunenevelofo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/dadobakawezatugeduzuxe.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/dofiriwodijezalad.pdfIn PDF document text
    • http://mcutech.net/files/jozafitab.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xozix.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/64557703508.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/99482407057.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/5622163081.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_07_06_30_12_1879.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/sawibinipiwopuje.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/64221696511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=connect+android+tablet+to+phonePDF 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_off0000af46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 10616 bytes
SHA-256: 76ecb274e20a392509140a1e91544059159feb257b567a2e6de0a92da2e92da3
font_02_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 16120 bytes
SHA-256: 200483443b9368b9a1b8be023661bfb11e22fb51cbe5e9db82e4cd1f68563409