Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c563a71ef9787e9…

MALICIOUS

PDF

77.7 KB Created: 2020-12-25 11:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d24626ff4d8d0e9b8fd3eb0ed98dd3d0 SHA-1: 126e4768cdefdf6253b03948b5f13525199dc9c0 SHA-256: 0c563a71ef9787e9cc0c3196765793081a6a74d93f2fe02d363a6fba31a9d7aa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding of a PDF link farm. The file contains numerous external URIs, with a primary suspicious URL being traffzset.ru. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffset.ru/123?utm_term=stevens+family+taekwondo PDF link annotation
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/463272b4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_5fb367817f66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_5fa5e9ead75f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5fa58c026d554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f912962a6efb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/totomup.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/chrome_app_launcher_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/is_click_clone_and_cash_a_scam.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/fire_report_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/grand_total_in_ms_access_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/joseposimuwij.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/411678604.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 5380 bytes
SHA-256: a81a725e311c10d8a1f7ff1cf4466b109bf7c64d310142117116e86136dd1d53
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 11744 bytes
SHA-256: b5e0332a47047de25603cd81974749bba8402acb3f8c5bc650213f41935d7294
font_02_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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