Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a9b9034437d21…

MALICIOUS

PDF

82.4 KB Created: 2021-06-09 12:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8b5bf56c8a0962a42e8bbad2b3681b53 SHA-1: 3ef1c08476428ea44ae7407ec5eacbc0cdfdc66c SHA-256: ad1a9b9034437d21c79587dec8ae66d23cfc0e70124c66388b8e80c3783e0f5e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary URL, https://inwebjor.ru/pbw?utm_term=construction+simulator+3+apk+obb+download, suggests a lure for potentially unwanted software or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/pbw?utm_term=construction+simulator+3+apk+obb+download PDF link annotation
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/2116061.pdfIn PDF document text
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/31246398e361a03.pdfIn PDF document text
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/76432935c.pdfIn PDF document text
    • https://nukijevexumi.weebly.com/uploads/1/3/4/7/134714394/fudonat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5ff1cdb95f9bc.pdfIn PDF document text
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/693210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424011/normal_5fe3f975332f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_60bcc4c29ed89.pdfIn PDF document text
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/6355818.pdfIn PDF document text
    • https://musegozaxugovu.weebly.com/uploads/1/3/0/8/130873783/rijuwisoliraxowu.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/864685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502511/normal_6002fee975b1e.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/visurobu_bizasaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144769206/summoners_war_transmog_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b186df-5184-42de-ae00-0280f936c1f3/best_penny_stocks_to_buy_right_now_on_robinhood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4477d2f4-f912-41d9-8c07-3c2ae919d741/russell_hobbs_breadman_ultimate_manual.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144554817/livoduzeperaxalumebalew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec38d19-3bb4-476a-ac14-d683c8be2513/what_does_woke_mean_in_current_slang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0df5bbb-6169-46d1-a882-4068362449a7/38844575486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0183644a-0bf3-4203-8d21-12a8b47f77c6/38395304514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2203acf-7736-4156-90a1-5c5e547037c7/bijewuvoduwogena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9181db80-82ee-48dd-b4f9-0ab146b4db53/dodge_caliber_service.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144674331/best_survival_food_kits_2020.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5584 bytes
SHA-256: 607ccee15613aed3cf0cb2d3984863cf4ab29254032cb1d7fb2c828350e8a266
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 11132 bytes
SHA-256: 4e98f270aef87ce857a8899c4ea1a4e3211dbcacbd84ff9d3998f14081e01a0e
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6