Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf41951c3480f03…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 10:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70ccbdfcfe4cda5b5a02353f9b5db8e8 SHA-1: b063a7f8ec65d75b81726444affc3b4a0c28db23 SHA-256: fcf41951c3480f034228a6a07c83d14445f04f97a59bbe6d40e5c6dcd7f719ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and ML classifiers as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=grand+theft+auto+v5+apk+download PDF link annotation
    • http://autohondl.cz/userfiles/file/67139630544.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/zifixebeba.pdfIn PDF document text
    • http://domosplast.hu/files/file/16859103338.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/53317228694.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/16160926213.pdfIn PDF document text
    • http://blccy.com/userfiles/files/59444794606.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914122242.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/mokomupumapukajoruvijomoz.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/kovipobuduba.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/23661469068.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/diluliwuzal.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/gujojurerutabebefubo.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/6909614172.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/4404767614.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/36009102245.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404224742da---pasubakowiz.pdfIn PDF document text
    • http://moristas.com/userfiles/files/81733386209.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109121625112982.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/bixetinupikerezugu.pdfIn PDF document text
    • https://siroyensao.com/upload/files/futexidafogulumo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52174838---33498725443.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/6655508218.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10852 bytes
SHA-256: b146771ae634945fd9d5ca2745e6202a4c3836eac779860e2601cddc7af89932
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 17540 bytes
SHA-256: 6a71fcf44fe3a1b196434d895007c02d513d0b804bb2d1195f7fb74e91943b4f

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