Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9171935f47ce26…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 16:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5761d40e00ffb51046d4a9f8e0671235 SHA-1: 0fb2121bb0c53e4826663536ea5c9a9cfef20cb9 SHA-256: cb9171935f47ce26d22334427d35e57f98f9cf3eb080afce52ec6b7cdbb8796b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a probable phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=android+location+based PDF link annotation
    • http://splhardware.com/UploadFile/file/2021090918183873499.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090514551673499.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/30000698885.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/99536904646.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/44616907885.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/soselimun.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/zopazigo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/78641465136.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb556b2882---17428736239.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/17444735731.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/baletofugibafajif.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/sakezolavilunuta.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4e0903ecaf6f023266a0355c5f486926/23357785924.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/51179451082.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/1499050915.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/dofuzij.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/taxapofexeda.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44567137473.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/54165504273.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/17340770525.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/gajutejada.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210912234636.pdfIn PDF document text
    • https://olajpark.hu/files/files/30257310562.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/42885437988.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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 10484 bytes
SHA-256: 10abb7eb4520811fdaae21ff8ab238d5a7238af64880c1a50ad67646a53e190d
font_02_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 17104 bytes
SHA-256: 404f2cf4983122be67affa6150f729465a1517b69637d3f61eb7156b12aebe33

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