Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61028c3bcad23f8…

MALICIOUS

PDF

85.2 KB Created: 2021-10-07 06:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d7459038151514c5aefbdad92490555 SHA-1: 9393c91bf8d60b4624897a644875fcec6a88b07e SHA-256: c61028c3bcad23f896a6a049bf5ebc00a4b6f887fedb92eb9c78c24b9fcebf28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=sat+practice+test+5+writing+and+language+answers PDF link annotation
    • http://spostojow.pl/userfiles/file/zumupubovokudo.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/34597090904.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/98913056597.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/47259708222.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/67146177998.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/99018601176.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613902f6d676a---zegekired.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/95673173847.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/tujajizowozexewoxilenuluj.pdfIn PDF document text
    • https://attack.lt/images/files/juvika.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/72250298793.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/razozetepotad.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210915194802.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/58813981308.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/vitogemaxozatoxutamevo.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92156352238.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/71486135518.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/13398567202.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/munavagimixasafamozemoxas.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134379a292c5---81868155668.pdfIn PDF document text
    • http://orderkai.com/uploads/files/92530748494.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/7066056536.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bewitosotize.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/guvaziwi.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/batori.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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 18624 bytes
SHA-256: 61f56c7a7ec11562926029fd38c8d6b367bc8daa76fdda84805c97f223c6407d
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10964 bytes
SHA-256: 7216760de96f3be7c839e18bc212f255ed50669f33f16a6e7e81adaed5d916ae
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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