Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53c333241ba2d7…

MALICIOUS

PDF

81.7 KB Created: 2021-05-09 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22193ca9877d2ef6daed988c50ab63e SHA-1: 177f0f882649c6a87d5ae843c356152bc5555aa4 SHA-256: 1d53c333241ba2d7f5ef28dc28b150d916977ecdce949d7a5a3725609ef700ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized content, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely used to redirect the user to a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=maths+compound+interest+questions+with+solutions+class+8
    • https://cdn.sqhk.co/gasawivu/yiijfhe/beyond_the_sea_piano_sheet_music_free.pdf
    • https://cdn.sqhk.co/potexunajo/egihjjb/love_arthur_lee_songs.pdf
    • http://pazobano.iblogger.org/54891531265.pdf
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5ff768cc56b36.pdf
    • https://cdn.sqhk.co/gosuzufus/iKWajb1/vumaxevirejixuxububup.pdf
    • https://cdn-cms.f-static.net/uploads/4530171/normal_605007b7256b0.pdf
    • https://cdn.sqhk.co/nedivixozu/wjgdxhi/miraculous_ladybug_season_4_full_episodes.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_604d18c70ba24.pdf
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5ff845867feb4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/watajive/what_happens_when_hdb_99-year_lease_expires.pdf
    • http://fixufesasuz.epizy.com/cbt_exam_full_form.pdf
    • https://s3.amazonaws.com/ravuxudibure/kozalobasesu.pdf
    • https://s3.amazonaws.com/lonozote/mixed_fraction_addition_worksheet.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_7caac7a499474dd1b07cf5d1455a4aa1.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_f25b8d593ce142d4bc2b95f02e53b26e.pdf?index=true
    • https://s3.amazonaws.com/vesubodufisi/zodituwibonov.pdf
    • http://riwusuka.epizy.com/canon_6d_mark_ii_manual.pdf
    • https://s3.amazonaws.com/wibadinavosunom/80267330889.pdf
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_636ce5ff12ed440e80a67c8b1778ac57.pdf?index=true
    • http://sidunutisa.epizy.com/palabuzirojonafag.pdf
    • https://s3.amazonaws.com/bagisi/bts_dna_video_song_free.pdf
    • https://s3.amazonaws.com/nijudow/diwiduduruza.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/tikodopavexijisowa.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_124d63f2374e4a0697b0c61be9eae073.pdf?index=true
    • 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_off0000eb60.bin
f1eed6503db5e82e6d8fa999b3be99838911844b6b488897d7bb28d26c2fa623		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5732 bytes
font_01_sfnt_off0000fecf.bin
7cfd710eac142f876cc104e8a514e4533a16baa059933f2883076d8afb4c7ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10708 bytes
font_02_sfnt_off00012385.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16164 bytes

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