Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7107c60fa698f73…

MALICIOUS

PDF

71.5 KB Created: 2021-03-25 04:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3bf06f83905c19353ac9daceaa4c9d3f SHA-1: 331655b2ca488569a28d189de4eeb5d8cb80a701 SHA-256: c7107c60fa698f73419444c53dbaf92aff119f24d1503680039fbf8c3298c1f5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary one pointing to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/123?utm_term=amtico+form+rural+oak+fs7w5950 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5feede850e96e.pdfIn PDF document text
    • http://magnitoli-2ekran.site/26705442147xo4ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_6001ce601f93c.pdfIn PDF document text
    • http://lnstagramsecurity.net/what_is_desktop_screen_in_englishxxxry.pdfIn PDF document text
    • http://new-volosi.ru/http_nsi._teletalk._com._bd_applicant_copyfa1i2.pdfIn PDF document text
    • http://livecopyrightverification.com/order_of_operations_worksheets_grade_9tcnm3.pdfIn PDF document text
    • http://taptopbot.com/65439067739vcy9p.pdfIn PDF document text
    • http://esclick.pro/zapopebatugizon7niqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_600538b2a878d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_60302e0ddfa5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renureva.epizy.com/assembler_adobe.pdfIn PDF document text
    • http://gigixago.epizy.com/kumon_math_worksheets_answers.pdfIn PDF document text
    • http://kinugokapa.rf.gd/expository_essay_prompts_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc8c8dd-7ae4-4709-8878-d4356463a4d9/how_to_do_civil_engineering_drawing.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/internet_explorer_for_macbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/20357579431.pdfIn PDF document text
    • http://botasalipigu.epizy.com/wumomonijemenenejudodewur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1a0ce1-da2d-4fe4-9e69-3e3069d2ca46/colleges_that_are_sat_optional_for_class_of_2021.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 5672 bytes
SHA-256: f58f2b3670c0e2c6dec4f2dc25188edc37ffe9fc6b22397ba04f9e8324cb0ca6
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10232 bytes
SHA-256: 63cd512b434c8691bcc634ae1a78978204bff3996c5430f2e2d6d5dc4955285e

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