Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab2f3458c6c2385…

MALICIOUS

PDF

117.3 KB Created: 2021-03-19 23:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef01626f74179acdef906182183c4ca SHA-1: d00cb175013be150222936578fe8e0f117d7be97 SHA-256: bab2f3458c6c238583eb9c0ab97a000052b722754141a41881c9a651144f09a8
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'golowaki.ru', suggesting a phishing or link-farming attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'ML_NYX_PDF_MALICIOUS' along with ClamAV's 'Pdf.Phishing.Trojan' detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/wix?keyword=dueling+network+unblocked
    • https://cdn.sqhk.co/navotezive/gikgdjb/wesojovevi.pdf
    • http://kmplitka.shop/glencore_plc_annual_report_20169nyy1.pdf
    • https://cdn.sqhk.co/jututumogu/iiGTRJB/12931320942.pdf
    • http://re-capital.ru/ginomalitawejumexefaju5iatn.pdf
    • https://cdn.sqhk.co/wepigosogo/ieIlVgc/fontstruct_curve_tutorial.pdf
    • https://cdn.sqhk.co/jipodipotaj/IYjdSJV/rock_entry_music_ringtone_download.pdf
    • https://cdn.sqhk.co/labifikup/gh5jgIi/vabusis.pdf
    • https://cdn.sqhk.co/jakatote/yHxj3ig/masha_and_the_bear_cake_pops.pdf
    • http://fosipuzo.mypressonline.com/vasidaminizur.pdf
    • http://slamelina.website/is_adobe_flash_player_for_mac_freekchdy.pdf
    • https://cdn.sqhk.co/bidekidarub/cMDeasW/exo_pixel_art_color_by_number.pdf
    • http://govitus.sportsontheweb.net/blank_yearly_calendar_template.pdf
    • https://4123e755-5
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_4aa08b65a9d849728ef748aaaa5052a7.pdf?index=true
    • http://luzojora.atwebpages.com/wikisiroke.pdf
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_d4bdba8b3569402a91d28a4422698ae3.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_b037e057bd694610b8aba8357673a779.pdf?index=true
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_c89f0d724d5c4df9bcab124d93c88f20.pdf?index=true
    • https://s3.amazonaws.com/nowokil/roman_catholic_tamil_bible_app.pdf
    • https://s3.amazonaws.com/zeworibuzoza/ap_transport_llr.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_3084802805934d2b8e70a5aadcdeed94.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018dbd.bin
47582e73289c96a6b831fdda2e66a106c87f773ddce2bed7f37853d2c754d122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBD 5016 bytes
font_01_sfnt_off00019ef7.bin
1b796d797fdaaee46b83e1dc3f82d833193737565a0cc2153a7e879e952fbcfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19EF7 12060 bytes

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