Malicious PDF — malware analysis report

Static analysis result for SHA-256 539a7c297b95e5ef…

MALICIOUS

PDF

74.0 KB Created: 2021-02-02 08:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1fb37111a4df214ade87dbb350efaad SHA-1: 7771db9116bfc3fb8a26a55b02a521d3ffdc90d6 SHA-256: 539a7c297b95e5ef98601bfde4d9de72fcec230631500702dcb74663877a0838
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. Heuristics indicate a link farm on disposable hosting, and ClamAV identifies it as a phishing trojan. While no scripts were extracted, the embedded URLs and link farm structure strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=d%2526d+celestial+language+translator PDF link annotation
    • http://femokotafi.66ghz.com/dapinofarukamepazamapaze.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/9556808.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/e64fbf7ebe80.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/RhgSyic/xisokogarowiju.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/wFijaiL/fastlane_road_to_revenge.pdfIn PDF document text
    • http://forecast.bet/professional_adjustment_in_nursing_and_midwiferyq5nig.pdfIn PDF document text
    • https://cdn.sqhk.co/jozunufap/REf56lS/zibawukizu.pdfIn PDF document text
    • http://ygrash.website/chop_chop_meaning_in_telugu0n2bq.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/7Nidheo/infection_control_nurse_salary_in_uae.pdfIn PDF document text
    • http://passive-income.ru/korow173nk.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/tativilapap-fuzujowujibev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukasorepej.rf.gd/faa_aviation_accident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/messenger_platform_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/pijuju.pdfIn PDF document text
    • http://pimokizogo.epizy.com/beyblade_burst_apk_gameplay.pdfIn PDF document text
    • http://bomigezi.epizy.com/maplestory_m_fire_poison_mage_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/dufux.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 4156 bytes
SHA-256: d46272a35c141788e45a942f60d3ac75eba256168db5716376ff56f0f84bb3df
font_01_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 10348 bytes
SHA-256: 32c2c281346b1e2f82523909b0f70135b7ffc4dbcb0fab85c2c7ddc1837cdf8b

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