Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c1fbcee2cf8264…

MALICIOUS

PDF

80.1 KB Created: 2021-03-30 04:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 165c1266a4d7f9a5edc09a1e28a6e211 SHA-1: 18fe28d4422b5c9caeeef3ed6e93b72ca6959acd SHA-256: 48c1fbcee2cf8264ae4c35f9b499fcadd4f019b5c41cdeac39919db1fa4adc54
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 are to benign-looking documents, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://zajinet.ru/strik?utm_term=attack+on+titan+manga+ch+137+release+date', is likely a lure to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=attack+on+titan+manga+ch+137+release+date
    • https://cdn-cms.f-static.net/uploads/4446930/normal_601e76af7d2d9.pdf
    • http://fajufoturesu.sportsontheweb.net/anemia_hemolitica_nios.pdf
    • http://medilawibume.scienceontheweb.net/bl_theraja_volume_1.pdf
    • https://cdn-cms.f-static.net/uploads/4447878/normal_6011815483988.pdf
    • https://cdn-cms.f-static.net/uploads/4379046/normal_603d5a38b9d04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lapetagalelan.myartsonline.com/knowing_god_james_packer.pdf
    • https://s3.amazonaws.com/ropuba/factorization_worksheet_grade_8.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_cc1921399b8b4bb2870dbacb54c2526a.pdf?index=true
    • https://s3.amazonaws.com/bubisifapagefe/14974710614.pdf
    • https://s3.amazonaws.com/tulosa/anuraga_karikkin_vellam_movie_status_video.pdf
    • https://s3.amazonaws.com/vavale/duvisujozofolozumanojit.pdf
    • http://juludiripo.myartsonline.com/41320544117.pdf
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_45f5bc9e6a374d7db293b272a0f1a4ca.pdf?index=true
    • http://siwupogogu.rf.gd/south_of_the_border_west_of_the_sun.pdf
    • https://s3.amazonaws.com/penale/zusogononukibakolesuwafid.pdf
    • http://rudozanel.epizy.com/aladdin_4k_trailer.pdf
    • http://bezopiwuzalobit.rf.gd/phonics_graphemes_worksheets.pdf
    • https://s3.amazonaws.com/bibejovixapis/22559544279.pdf
    • http://xuxerutiwuv.onlinewebshop.net/jibinudo.pdf
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_57f41c0f85e642e28be132e2a9eef776.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_89e284c3774c4a2192f5b0e4b3b48c98.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_e3dd6f78945d4c0c804e22395c934c5e.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2e.bin
ff08ca73dac0942861950c5a6c58db729cee1c1aa86605a5be36091665a23db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 5700 bytes
font_01_sfnt_off00010270.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 2140 bytes
font_02_sfnt_off00010c48.bin
3353207f3c5d0aeffc9e4dedc9d2b6d6f5b8efd371587e9ba6eb0350f5405cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 11380 bytes

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