Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5b899eb19637a9…

MALICIOUS

PDF

86.1 KB Created: 2021-03-21 21:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c47cb5961f60dcef31af31e7c8ec7c06 SHA-1: 22b26d5fdf4880398ffae27c085cddb2e299bc5f SHA-256: 3f5b899eb19637a9837fe56e886a123c0247160e310bb39834fe992104356cdb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it functions as a link farm or a phishing lure, with one prominent URL being https://fokemale.ru/award?keyword=tour+itinerary+sample+pdf. The PDF structure and content, despite being heavily obfuscated, point towards an attempt to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=tour+itinerary+sample+pdf PDF link annotation
    • http://arnautmebel.ru/kuriwepopiwumena0ehm.pdfIn PDF document text
    • http://forecast.bet/lake_havasu_fishing_report_2019y8178.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/403170.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/0638df1be.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/remoziwunu_zaxile_fimalu_ronifozovumupij.pdfIn PDF document text
    • http://instasurprise.online/campbell_biology_test_bank58hg9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5fe5b1106560a.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/9395330.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/gamirenokowilo.pdfIn PDF document text
    • http://academic-club.ru/9619504641726oeq.pdfIn PDF document text
    • http://letxxnx.org/91215407268wlutz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_60184de92f132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fcbe236ea7f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5fc69f0a9d25e.pdfIn PDF document text
    • http://pop-marketplace.ru/675698552928nx2g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0336a8ef-736a-493f-be99-c2cdb09baa33/how_to_fix_an_air_conditioner_leak.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_82a138696d3b42bb8f051f942de7c492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bacf483-cfbd-4dcf-87b6-8142188578ea/spanish_english_dictionary_offline_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db084d4-2d3c-4319-b99b-7d7c0eee1377/jovafojit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03306d2-45f2-4109-9b61-30de74d9c5ff/vedujuxikuzivogog.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_70faac6adb9f4c5ea36e131e8765f2ae.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_8e6cd684d9184deda4808f32396ce4c7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 5120 bytes
SHA-256: c1d0e34f1f8bef4b33040e91c4800bc09e785d363c85dad030d84813e1b31400
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 11200 bytes
SHA-256: e6ee66a15d3095a420a466c4f65f4c7d152006a060ff868e65935683366d7806
font_02_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.