Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1c1c0ce0fe795a…

MALICIOUS

PDF

67.5 KB Created: 2021-10-03 17:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a45de23b9c92ff9a8328c602136c2b2 SHA-1: 8c973855b7a39ba513af5528ac4d2dfbd003418e SHA-256: fc1c1c0ce0fe795ab243e46982b39edef3f94b5f1928cf9b43a2899c9c4e04c2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic, to obscure a clickable link. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jan-fotografie.nl/upload/files/48757095391.pdf In PDF document text
    • http://ariogalospspc.lt/userfiles/file/ranetovuwudirinapura.pdfIn PDF document text
    • http://orthopediedelft.eu/files/83233123326.pdfIn PDF document text
    • http://df-2.de/images/daten/file/36551606746.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazasaka.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/jadujijamowusaronit.pdfIn PDF document text
    • https://bolahijau.com/contents/files/39834712737.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/74722433064.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bc0ql0hh79tf4cfbk50j5aec64/67802363301.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092807162631.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/rebivalufuzekodo.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/90930525156.pdfIn PDF document text
    • http://rongqichem.com/upload/files/2082023837.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/97429024317.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c4dec7a1dcd36d064d22ace95ba8fa4f/saxulezerekafonukobiwixe.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/1569327001.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/64222466284.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/99600331608.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/75784958859.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/mepilatibo.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/78083459901.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/64843638365.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/35223503449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=are+eggs+good+for+upset+stomachPDF 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_off0000ad7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 10904 bytes
SHA-256: 2601f9bb9bea289a0e420965041354a8d102ee2222d591b6b36757d94db1ceaf
font_01_sfnt_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 13828 bytes
SHA-256: 987c7aab44eb99bbac4f5ccbef273bcb94d3e54418c9730c8bc625df2b6466ed