Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ce24e0d1078a24…

MALICIOUS

PDF

83.3 KB Created: 2021-03-10 03:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 786f98478f9a38da2d6588b84ea9317d SHA-1: b3d44c33adc50110fc3e17f85ed6231b4b8e3d5b SHA-256: 89ce24e0d1078a247fb26ec3b4d479804b4d72ecb32f2515ade80030a733c4d4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, suggesting a link farm or phishing attempt, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of URLs like 'https://dafemum.ru/award?keyword=adobe+pdf+editor+full' implies a lure to download or interact with malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/award?keyword=adobe+pdf+editor+full
    • https://cdn.sqhk.co/waxobakal/97giaMa/warship_battle_3d_world_war_2_android_1.pdf
    • https://pikezusepi.weebly.com/uploads/1/3/2/7/132740337/1866608.pdf
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/528886.pdf
    • https://cdn.sqhk.co/puvubuzu/QifjctD/fasabuwuzopaxigabigeni.pdf
    • https://cdn.sqhk.co/pogezasamu/g8W3Mhb/94452747331.pdf
    • https://cdn.sqhk.co/vefusujix/jahhzac/high_school_girl_life_simulator_2020.pdf
    • https://cdn.sqhk.co/sabiwizi/DhcPw8W/selokejonenutukewulo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_aa78b339f3974fe1bcef48aa07d05366.pdf?index=true
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_e2d54a8c066143fc8b9fe3171c0eef8a.pdf?index=true
    • https://s3.amazonaws.com/lomuper/the_lion_king_2_full_movie_part_1_youtube.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_f84ebc8c14ee45f893c60ee4aa036e71.pdf?index=true
    • https://s3.amazonaws.com/xeroguru/wutujujatinovavapu.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_fbfbf8d47e7d473d96ce4ecf02c0f806.pdf?index=true
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_95f839b3f06b429fbbbfb58e7f1d0e43.pdf?index=true
    • https://s3.amazonaws.com/nowonovege/37907565771.pdf
    • https://s3.amazonaws.com/sojuravewi/6th_grade_math_decimals_worksheets.pdf
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_41621e9bc8f54f0d989ef5c2515eb72d.pdf?index=true
    • https://s3.amazonaws.com/wajibile/tiriludexogab.pdf
    • https://s3.amazonaws.com/limewub/inside_al-_qaeda_and_the_taliban.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_1fd567bcc0db4808afc31a45bb9f7ba9.pdf?index=true
    • https://s3.amazonaws.com/fekife/business_financial_report_template_excel.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin
a98bdf2cbc5a38a7457e31c2ec7f6db15704da27faa90fac4185160c64357a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 5204 bytes
font_01_sfnt_off0000fe0a.bin
a4dce38e6930d69fb995b965452ba114fb3d62a1d3d69cbc079bf3908f19abdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 4552 bytes
font_02_sfnt_off00010d94.bin
8206ae3efb7d0d0a5a57d3294a16df4e51a574819f5532483ce160fc15114ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10504 bytes
font_03_sfnt_off00013186.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 4324 bytes

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