Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd8cce2aed7f653…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 16:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8bcad9931836d14556f5932a5c167bff SHA-1: 61eb7cd6675c46f151671c717eb920840e3e7506 SHA-256: 1bd8cce2aed7f65358b6ffca0a0fca9b1ca3b176ec964d1bf1e5b70bb1c5d1a1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to other PDFs hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=yang+2020+website PDF link annotation
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/6bdbb752e.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/sefarugizifexijabev.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/5f563d6dfdf708f.pdfIn PDF document text
    • https://dujakoxuk.weebly.com/uploads/1/3/1/4/131483447/1078767.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/503a61b43a2.pdfIn PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/fejagex.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/6dce66d.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/Jrijghm/eon_player_pro_apk_full.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/how_to_replace_belt_on_maytag_washer.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/bapikila-duximuve-kawefil-bomupopafu.pdfIn PDF document text
    • https://rawuvuxa.weebly.com/uploads/1/3/4/0/134019107/mikavobaligujo.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/lubitoj.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/kinugibudeso_gagex.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/cuentos_2_edgar_allan_poe.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/5095849.pdfIn PDF document text
    • https://cdn.sqhk.co/vavapezami/4rihhgs/post_address_icon.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/jesamazemokukeloja.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/jawonuborubinobozikavuzef.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/e25ca313-610d-4110-825d-7f982cad3d32/69399785062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d4bef9-7fe6-4874-900f-4ae45c02ec08/74444795529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edf35e8-6fa2-43d1-ad1e-2f29c9400411/fiwukekufena.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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 5192 bytes
SHA-256: 3744ab66ca2359e6909edecfe77d273b20019de6542e6895dda58d66ab9f07b7
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 11212 bytes
SHA-256: da17a1e9e57695c534de9af8857f0235be7517807f0386f0796661e8713877b2