Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f8c16b9ddf0e45…

MALICIOUS

PDF

74.6 KB Created: 2020-11-22 02:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a409228099a98e06b5b7e2569678503 SHA-1: 553de037075065c50c917b09c7beaf2b01d09b96 SHA-256: c9f8c16b9ddf0e456e99337267d90197a75eca0349229bdc3ab678d893ce719a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to generate traffic or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=db2+sqlcode%253D-407+sqlstate%253D23502+sqlerrmc%253D%252An
    • https://cdn-cms.f-static.net/uploads/4454277/normal_5fb8331db4c18.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f9683139ec5e.pdf
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/a1e331659ab.pdf
    • https://pivakezajategag.weebly.com/uploads/1/3/4/6/134605748/xikujanofajojof_bojemilebalo_doxokixigiwez_vikid.pdf
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/xagitelavezar-rumizivevije.pdf
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/tigejafuwus.pdf
    • https://kutesavakelex.weebly.com/uploads/1/3/4/3/134336058/c894ef049ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9009cbab-1909-4b66-af8c-b4c871be0abb/supemixikemomevapi.pdf
    • https://s3.amazonaws.com/dorulusof/11934861911.pdf
    • https://s3.amazonaws.com/guwutivupudutu/bogokuvudubidag.pdf
    • https://s3.amazonaws.com/sajatesawodiji/erik_satie_gymnopedie_2_piano_sheet_music.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/ohsaa_football_rankings_2019.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000cbdc.bin
c7739280241cb872d19250806ff9f171db8e1894f8dda08fa355da4280ea6948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 6228 bytes
font_01_sfnt_off0000e117.bin
8fe4bfb0133169a8a83eec92549d3e8ef72338979c0045388048952ab5b8893c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 11460 bytes
font_02_sfnt_off00010853.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 16036 bytes

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