Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afe1fae3a8a2baa…

MALICIOUS

PDF

76.9 KB Created: 2021-05-24 11:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f01009e30c4e2fdfbbeb20dde10457f SHA-1: 5ac3c99451cbc21d39a6d01b08478a4534fdc333 SHA-256: 8afe1fae3a8a2baa317f37e256000a492ad33fb0f42dc54a29c48c37b5070872
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. The primary malicious URL, https://nipisod.ru/strik?utm_term=crazy+frog+piano+notes+sheet+music+pdf, is presented as a search result for sheet music, likely a lure. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=crazy+frog+piano+notes+sheet+music+pdf PDF link annotation
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/zeduw-farano-nofisu.pdfIn PDF document text
    • https://lisobigu.weebly.com/uploads/1/3/1/6/131606175/57071ae8e194c.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/9946264.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/mijop.pdfIn PDF document text
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/9050913.pdfIn PDF document text
    • https://lujogome.weebly.com/uploads/1/3/4/6/134617312/8320665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dc0e15-2bef-441c-9576-e39ab0c327ca/jutowekafarepuner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7c3384-f260-4bcc-9f48-9cdf73e61ad9/hp_photosmart_5510_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23aa493-2dd3-4dbc-9fa4-07b24919664f/fundamentals_of_physics_7th_edition_student_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ded7e6-2675-45be-83f3-928313a959ed/vampire_diaries_stefan_love_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1684b1f3-c425-4cc3-a03d-dd8bc532185e/eyelash_extension_waiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74ba605-79cc-4c55-8482-c0f0ce609a18/paloma_tankless_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0abdaa5-d567-4a95-86fb-f1b9afb211f4/48719316332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac07a356-5f64-4edb-a7f8-5bce430d25ab/zijojegoruwalusuzan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853e92eb-2083-4aeb-a486-2c5a08686db1/34617228220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be79300-6085-489e-b84f-bc93c674c81d/cnn_news_on_the_election_coverage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c758a45b-caf0-4bd2-9b14-b3d65fd0ec54/42759701804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05024b2c-2eb1-458a-9a45-8f89c8b3f781/viseposenomovofavebuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f7da9f-afe5-401a-843a-934f58760684/health_o_meter_scale_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a2b457-d2ce-4023-b9e3-066de4619c1a/jovufoviseropofim.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5592 bytes
SHA-256: 84c5193e4d64d7b3d185c7bf1132b56316b9143875bc4451cdd232f26a01bdbb
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11112 bytes
SHA-256: 7a1a785ff61f847e1fc88b86074eeab942abf91b78885e623f4be820a41482cc