Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acee19168945e0b…

MALICIOUS

PDF

101.9 KB Created: 2021-03-24 10:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 67b97098d4be03370253709b703eef8f SHA-1: e7c093a03652feb462553e43ae41f16657f67ad6 SHA-256: 7acee19168945e0b63439a829bd0f93cfbacb446eaf4018dc5ec299b46a67638
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=backpack+literature+6th+edition+ebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60545ef030299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_6031c6e009144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5fd12a5b120b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_600fdf78aabbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fddbfb0cd274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_600e6199478c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409606/normal_5fcc2eb484880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakilasefit.myartsonline.com/matching_linear_equations_to_graphs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/genetics_12th_ncert.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/tactical_aircraft_maintenance_air_force_bases.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/dometic_thermostat_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/nowumavutuxutoxuzosus.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/43964379144.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_67401e3351b34e6f8c951c4876055b40.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_b4cef9ad4d994659b1b5cf04767d377d.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_24c909bd6ce5446d8e016d936fa03754.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea39332-0d32-4198-a233-06886a02c973/how_to_update_genie_directv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9883c9-320a-455e-8231-3d229bc84e82/tableau_training_for_beginners_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66590171-5ca0-41d7-aa08-f3de4def69b9/litegolezafututotapugen.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/xijiter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e3db3c-2e42-4c60-b8c4-de148e20bcde/sobijafabeputazepuj.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/mera_bhai_tu_new_song.pdfIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_d445b5059e6f44eabc2b93b943b97b19.pdf?index=trueIn 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_off000150eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EB 5392 bytes
SHA-256: d459b9b4b6b220b999a94df9b1cc3d8dc7d17f4b3a623e784ae4d55aad0b76d1
font_01_sfnt_off00016334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16334 11816 bytes
SHA-256: ee4fef1bf5ef274e7e1175309a69d0c371001405f86cdab3c288e2978a6df4bc