Malicious PDF — malware analysis report

Static analysis result for SHA-256 122cbaa07348651b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 19:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3da6e5d939d8844ceb0fb5940873cfa4 SHA-1: 971f06654a5d94c5068066c72b7223dcf6fa52a2 SHA-256: 122cbaa07348651b65f23a1adc9266a932a5b8fae3e05e9f9d9700e2a26d64d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One of the extracted URLs, http://tufuwavaziga.mygamesonline.org/66398287763.pdf, is part of this link farm. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=crazy+frog+racer+1+game+free
    • http://tufuwavaziga.mygamesonline.org/66398287763.pdf
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/sazupejoxe_tumuv.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/seloki-surovovarapek-tufasaxufizomel-jesokiroliso.pdf
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/1301075.pdf
    • http://letxxnx.org/educational_animated_videos_free97cso.pdf
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/4165930.pdf
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/b14238eb728.pdf
    • http://amsidisi.xyz/wepujanojiwamuza3al4r.pdf
    • http://carluxepaint.site/5983310983m0ky0.pdf
    • http://like-store.site/bootstrapping_in_compiler_designi1whk.pdf
    • http://begemotiks.fun/45257572994hrmgz.pdf
    • http://firstsecu-paypal.com/95390625709ty7pd.pdf
    • http://gaximivotekole.mypressonline.com/fotimakulufetevozez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/550eed48-9122-418c-bb10-f57417b7ff48/25427604697.pdf
    • https://uploads.strikinglycdn.com/files/123c6d77-752a-4564-9a9b-32cfdd7c3b8e/i_heard_you_paint_houses_frank_the_irishman_sheeran.pdf
    • https://uploads.strikinglycdn.com/files/68edac46-d2f8-4618-937a-261b9c9c47a3/28922395395.pdf
    • https://uploads.strikinglycdn.com/files/8cb630ec-6fd1-4ffc-9faf-573fd8a14ebc/92162988820.pdf
    • https://uploads.strikinglycdn.com/files/4067ed44-a0e0-4a2e-aff1-437c88ea7d6d/stanley_500_amp_jump_starter_with_compressor_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/b04e78bd-1540-4c2a-b393-73ad8a6d2d1e/niripovumi.pdf
    • https://uploads.strikinglycdn.com/files/02314244-ee19-4dee-9780-ffe70871086f/30814434205.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a6.bin
ec96dfa7bf08fe4231aab51f31885ab579febdaf0b62e6cf58b110f98bab311a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 4772 bytes
font_01_sfnt_off0000f0fc.bin
f0e2d5707b812cb1c37f75e75b94455e7c9366f527eb5ac998e9915d6407cf38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 11496 bytes
font_02_sfnt_off0001180e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 4324 bytes

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