Malicious PDF — malware analysis report

Static analysis result for SHA-256 465ec1dd09fc0b25…

MALICIOUS

PDF

67.6 KB Created: 2021-09-11 10:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d71272c4ddb88a5e9fbeb011f75c1b2 SHA-1: 86baad328ee1b26d6e2ff502cb4ab0c75bbf1403 SHA-256: 465ec1dd09fc0b250757420287b98eb39804e280075d3595bacd15ca1af260e7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, containing a clickable action that directs to an external URL. This pattern is typical for phishing campaigns or malware distribution. The presence of numerous disposable links and a link farm further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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 https://inwebjor.ru/uplcv?utm_term=grammarly+premium+free+apk PDF link annotation
    • http://0975811252cool.linker.tw/files/70026724609.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/vekabem.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/61204429279.pdfIn PDF document text
    • http://insei.eu/userfiles/files/13287946974.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/63902610782.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/63201986049.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613157484bc32---revogefokisosakorirepe.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/jagubexomonige.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/75830019164.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/73846424434.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/58559070444.pdfIn PDF document text
    • https://viceda.com/userfiles/file/32516411320.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/93067674913.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21c27176f---94219428684.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/64567854123.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/tobatekuseriwilurinaver.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/22987840654.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/xekag.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/pelab.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xiwevuxuzodevavebirosi.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_off0000ad46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD46 10376 bytes
SHA-256: 65b88c8fcb2ab594fd8498b388c2d23c47ecbf006ae749ca4c62956750ee2a65
font_01_sfnt_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 14432 bytes
SHA-256: 40677e1381097dd951e7bb4f5167b4a1bfac9a1c2cd8714f4d86d030f63646ab

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