Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2652eb1d6b498f8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 18:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c1a984dac13eafb1a2da7c39cee6a04 SHA-1: 7faed5f3196fff120afe805c2e59aa8215c09878 SHA-256: c2652eb1d6b498f8a0d7f364574c8f7ca065f2e0b319e70b36ba981919c68af5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://panel2conso.com/userfiles/file/78021027520.pdf In PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/verumopejosexew.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/29330358364.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nimekozalenumon.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/pozutidipipapimupomumigev.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zabeburetus.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/32619343178.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/3158600305.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/57260471976.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912064750361529.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/sokaxipade.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/97522705341.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jagozif.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/85962119036.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2ac287aulmag95lfeboaukrs20/66551086881.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/13668843456.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/9488013398.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/20705306690.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/wevemo.pdfIn PDF document text
    • http://parentini.it/userfiles/files/1110496614.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/43818715469.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/makiguxosavated.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pic+collage+pro+apk+2020PDF 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_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 10512 bytes
SHA-256: ce68db299e5cd55a9a93179b0f00007dd0c24fe3ffb02bae19e64a240620a06f
font_01_sfnt_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16644 bytes
SHA-256: a5deb46fcc9b8530391ccfee842009cf7b42e7c25a1150f097655584c96ad29f