Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6e32681854bdac…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 03:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b4a3ac263c0b5d7fa8d754feee842501 SHA-1: 72a0b267cce6cb7c1b1ccc55ca446fc96182d372 SHA-256: fa6e32681854bdac6b6cb52ace6ace6087fbd16d1c42609b1830b6faeada78c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://onderdurdu.com/upload/ckfinder/files/26774415.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/gixizewusobefafofap.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/8584638919.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/78621938356.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/neruvedodupitisuvabedifur.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/54328891280.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/xikopuvuxakaril.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/98507087963.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17b08107---14522368339.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/bunizomoxaviwetiwowidef.pdfIn PDF document text
    • https://spyboarcams.com/files/66930003808.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4a0c64998---65144308164.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/bexumasotepimelivaxenakex.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/34954564820.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/gutajidoxoborapirazu.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/tamabasivelifovakogum.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dujisojemujotukejozuj.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904044322150130fpo783fz9xwk.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/97629660636.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/gawimizimamilaf.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/35644585691.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108312221588740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+ant+man+and+the+wasp+123PDF 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_off0000ae20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 14772 bytes
SHA-256: 5100686bce345ec1747f464f75773b8589be1fdf603a6e22b9b4af2fc4938055
font_02_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 10844 bytes
SHA-256: d69e914623675524b8ee158cea16dc9b5715abc5e794ab99c774ac593f37eb9a