Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b26b73934ecaa4f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 05:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b353ac19c3f936feb9dde73b339005b0 SHA-1: 5b255bfba7fc3fbd7b0466a9c7b943b586b9ff0a SHA-256: 5b26b73934ecaa4f162c1b415710bb58f34e503994801bac921bae709d9f6800
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. The primary external URL, https://jumiwimov.ru/strik?utm_term=what+is+economic+development+in+geography, is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=what+is+economic+development+in+geography
    • https://cdn.sqhk.co/duxisabaza/dhirivn/pixelmon_mod_download_tlauncher.pdf
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/27f876.pdf
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/9376041.pdf
    • https://cdn-cms.f-static.net/uploads/4485703/normal_5fe651dc34577.pdf
    • http://vuwazakuzasoz.iblogger.org/gejufenawimiline.pdf
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/4750195.pdf
    • https://cdn-cms.f-static.net/uploads/4443337/normal_60622fe42a501.pdf
    • https://cdn.sqhk.co/pujixefan/gGX2Zgf/minecraft_monster_farm_2020.pdf
    • https://cdn.sqhk.co/nogorodizet/UyigSjg/fipojowimewadidukejezuj.pdf
    • http://kiwirixup.22web.org/74372166525.pdf
    • https://cdn-cms.f-static.net/uploads/4449987/normal_6009f519329ac.pdf
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/winafiperedebit-kuzalejakoj.pdf
    • http://sokuzise.iblogger.org/year_3_maths_quiz_worksheets.pdf
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/53e381c1ee8ad0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3e231452-7ed4-4546-8355-390e48b9434a/what_do_word_formatting_marks_mean.pdf
    • https://2d51130c-4aac-45f6-abb4-0e35df00072a.filesusr.com/ugd/b972d5_341a1e3f9bde43ef99e170591a0687c4.pdf?index=true
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_53916d01c293429ab3e1c0d243aaec98.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c29ffeb-ae19-4615-864c-74922062deb6/lodazasol.pdf
    • https://uploads.strikinglycdn.com/files/b4ecdb14-892f-4d69-a1df-7555f71adcff/john_deere_42_snow_blower_parts_diagram.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e754.bin
f24e591563adc24ddeda90118410c6ab7bed9cd16871acf212d526ceabb65994
pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 5452 bytes
font_01_sfnt_off0000f9bb.bin
b4a3005f5bd3b030bde629c84b9b6f6ae1865f0e39aaa84b0021bcb86c705785
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10848 bytes
font_02_sfnt_off00011e93.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 4324 bytes