Malicious PDF — malware analysis report

Static analysis result for SHA-256 70791a780652e9c8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 07:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff63322a916688b517fd923267f72deb SHA-1: 8bae2f4152fc147961dc7a17be814983189e90b8 SHA-256: 70791a780652e9c8bf9446d98976c11fd68ca2d731e9f3b787a51e7f927d96d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://canevastoilestjean.com/upload/editor/file/57975746413.pdf In PDF document text
    • https://spandoekland.nl/userfiles/file/93656718194.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/winevidewifudipufomisore.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210909230639.pdfIn PDF document text
    • http://midel.me/userfiles/file/84994924670.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/liruzerirurira.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/79981369781.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/33998611664.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/wosisakefifavapetuzalo.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/11371540356.pdfIn PDF document text
    • https://abss.pt/userfiles/file/39018689706.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/81100556171.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb33c5c3c3---safufigajewuxisikoxagifi.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/tigujizopapawufisizif.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/55981962610.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131914f0e7ac---tixirazokolavulobikafa.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/97952126977.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kebilafumusekutim.pdfIn PDF document text
    • http://geoman.cz/data/file/nowozenetivunol.pdfIn PDF document text
    • http://twilaw.com/files/files/xolidaxorodasijiwosezafa.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/zitotataf.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/7958181094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=unfollowers+mod+apkPDF 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_off0000b41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 15944 bytes
SHA-256: 5ea77094ff2a5c1897e2a54cbaabe246a498d900fadf6a2203ffee59e3ce8ed4
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10656 bytes
SHA-256: 3b52946bf35c44b54ebfd6e30cc188fd4fc1b26db0a976e557ebefb9396d8550

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