Malicious PDF — malware analysis report

Static analysis result for SHA-256 058e36e4bd3bb920…

MALICIOUS

PDF

78.9 KB Created: 2021-05-26 19:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 49d3494b8be740a196112ce5c5cbf759 SHA-1: 21efa7e9384bb8284cf3445fd1e175f57f0fb981 SHA-256: 058e36e4bd3bb920471c76552ff59ede7e258ead3a9a2ed6bf78e037758f7103
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The primary URL, 'https://jottigo.ru/strik?utm_term=crash+course+anatomy+and+physiology+worksheets', suggests a lure to potentially malicious content or phishing pages. The presence of embedded URLs and the link farm heuristic indicate an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jottigo.ru/strik?utm_term=crash+course+anatomy+and+physiology+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387928/normal_6002dfe72706e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_6039d4424f957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_601f003332ff0.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/kewotuxod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371553/normal_5ff6830cf0277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_60149d9d4bd67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6056d7917e40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_602d2b55ba12a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_5fed67a9f018f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fc7ee510bfa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_604aaae5945e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_603e4858e3459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5ffa15703ed31.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/2760070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60326e51cf70b.pdfIn PDF document text
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/9481790.pdfIn PDF document text
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/9778016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5ff906c1a530a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5fe1895140fdf.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/c670b1b2-3702-4f04-80e9-bc250ee0065b/high_probability_trading_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d18e01-0e2a-4da4-b61e-4ad4cc5185fc/addition_subtraction_multiplication_division_word_problems_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7bcde2-46fa-475d-9dd1-b0c1f00eb446/bajox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87aaf5f-531e-4ea5-b626-c3c3c6850772/how_to_replace_a_mitsubishi_tv_lamp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e56a8b-0314-4b48-8453-4c02c10132bc/jibejepuwot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c837d5-ac58-4be9-9441-dde5fb823613/visual_basic_6.0_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a4232e-87da-48a0-b902-b9c98a8bcae5/adobe_illustrator_cc_2015_mac_amtlib.framework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30364274-8fc1-4e49-a0dd-6de4885f81c2/we_were_liars_characters_analysis.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 5652 bytes
SHA-256: 266b2bd5b445e889139954972d37347509fd42ae1bdb6e83d32c850cb5121acb
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10724 bytes
SHA-256: 82c5256a8c8d269192d8fae4a66721341981d21f00e19555c2a0c7ecc46dec1a