Malicious PDF — malware analysis report

Static analysis result for SHA-256 09de4f1f328ae2c5…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 00:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1fd6421fe160e01dfc37a1869ca522a SHA-1: 19e96a84fad5e3145f28caf1717e7724e16be75d SHA-256: 09de4f1f328ae2c5c99335738f71181c629ea60ceb2ccea7fadb89959c699425
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=gendered+worlds+judy+root+aulette+pdf
    • https://cdn-cms.f-static.net/uploads/4469641/normal_6026a6251f795.pdf
    • https://cdn-cms.f-static.net/uploads/4473947/normal_603c362ec2715.pdf
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d290e395c.pdf
    • http://phtech.site/common_core_sheets_dividing_decimals_answer_keygziaf.pdf
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff0bdf3554cd.pdf
    • https://cdn-cms.f-static.net/uploads/4391314/normal_60285d2b36e5e.pdf
    • https://cdn-cms.f-static.net/uploads/4387808/normal_6039db20ce1ba.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_60466be4179ab.pdf
    • http://udilische.club/ragorazexiwikefex2utqa.pdf
    • https://static.s123-cdn-static.com/uploads/4370319/normal_5fc9418b80455.pdf
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/6425417.pdf
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5febe4e05fb20.pdf
    • http://reduslim-ordina.site/philips_universal_remote_codes_for_sanyo_dvd_playerijzkd.pdf
    • http://gelchlen.fun/motu_patlu_cartoon_movie_vs_mobivj5qm.pdf
    • https://berijuwijupev.weebly.com/uploads/1/3/1/6/131637896/8394259.pdf
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/xezukedo_sowaga_binojebajufizok.pdf
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fea1a42a4feb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4bc45604-4005-45a8-ba9a-8d6f0f1e84e1/iworld_bluetooth_speaker_system_for_home.pdf
    • https://uploads.strikinglycdn.com/files/cd8f06c4-d37f-4ebf-baf6-ee1b28936a1f/18774799855.pdf
    • https://uploads.strikinglycdn.com/files/78ae01c8-42c6-48ee-9bd4-b4e158c643f2/66493957324.pdf
    • https://uploads.strikinglycdn.com/files/c2371e6d-7f57-4dd9-b2b1-7daa0257b931/cajun_injector_electric_smoker_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/c096a093-4634-4636-bdd7-4cea3050d96a/98856281589.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe22.bin
6dd29ddc3a17e1f276f592d5e121733a80bd1e99e4d0c5ec3d0680acfb8fdfe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 5336 bytes
font_01_sfnt_off00011077.bin
f4dc1c9507d83a82a04381af3a77e5ed5954dfe662cc51fe012832110a38c280
pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 10680 bytes