Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c48786f2652bd5…

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 17:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04835cc15aaff5aa963d4e52331cc069 SHA-1: 5236cb22beb04b7ac311345f8826c07bb02d55f0 SHA-256: 39c48786f2652bd5011f00ce92403c433983f58fc5064b1862783e0130bd2a97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detection and ML classification indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://akcjonariusz.com/UserFiles/file/14077727891.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/31888195921.pdf
    • http://robalton.es/Albums/images/file///bisurubinetazezijoxuzivi.pdf
    • https://takipcisec.com/calisma2/files/uploads/75236112119.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/64846244022.pdf
    • http://valencia.thepokeluau.com/uploads/files/xorexobamifunapedinewobid.pdf
    • http://safaraval.com/basefile/safaravalcom/files/46238218289.pdf
    • https://value.ae/userfiles/file/61717639453.pdf
    • http://millionsdiscount.com/mo_images/files/7114715871.pdf
    • https://tspinstruments.com/cache/fck_files/file/10989901448.pdf
    • http://softtox.pl/new/userfiles/file/melalafenematorowi.pdf
    • https://stpm-sa.com/userfiles/file/81492644371.pdf
    • https://tahubunting1.com/contents/files/lovamol.pdf
    • http://wych123.com/upload/files/vopenetem.pdf
    • http://mosvag.ru/img/lib/file/55423917285.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b4b8a96ad---siwukezosuwiku.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/95310796564.pdf
    • http://mega.kz/media/upload/files/mogabumitevukufosivi.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/javezagiboje.pdf
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903193654.pdf
    • http://freeware-software-download.de/uploads/editor/file/lulofexipapasiwota.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+olympus+has+fallen+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c092.bin
19a1b671b8c2fd2d212472dfb6b65c3a5e4d973f3e1e950ff90a0a74d2168c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 10952 bytes
font_01_sfnt_off0000d9da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16792 bytes
font_02_sfnt_off0000f1ec.bin
11cadc313e78c11314320c60da9b966e7922a6f4ffa27bab5705ce09b40660f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16584 bytes

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