Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43229683e73af71…

MALICIOUS

PDF

84.8 KB Created: 2021-03-22 03:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4eda2136e55981aa238ef171fe3adc7d SHA-1: ee60f6c4ecef42381837571572ce75ad1ae928cb SHA-256: a43229683e73af715fc46d38a2957f6e738636e41e39d3b88e957f2594d575b5
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 functions as a link farm, embedding numerous external URIs, with a primary focus on SEO manipulation. The document's structure and embedded links suggest an attempt to drive traffic to various websites, potentially for phishing or distributing further malware.

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://kuzutuzo.ru/wix?keyword=half+dwarf+half+orc PDF link annotation
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/wefon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_5fd144ed2fc64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_6020b4959e7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_60108cc7abc96.pdfIn PDF document text
    • https://gisunotagalaros.weebly.com/uploads/1/3/2/3/132303086/963865.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/8173599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_60556b1f48524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5fff051ca6c43.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/fudevakesegudif-nadid-nanekapeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5fecfb8f469c2.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/sifojuradul-zekabulelasim.pdfIn PDF document text
    • https://wifiluguzuz.weebly.com/uploads/1/3/1/4/131437957/kemepano-xolugakolejaje-vitavitenidoz-batexulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fc6a2a7ea4b1.pdfIn PDF document text
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/99c19b.pdfIn PDF document text
    • https://rezolokad.weebly.com/uploads/1/3/4/7/134718373/482b24ebfd.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/tipexaxaxeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/liberation_theology_in_latin_america.pdfIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_e6aedfc9ec8d472aac6bb791512fb4c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lepefi/nanetanopobipepatokove.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_425e246b14404493bc6c0dd514f838d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/70595824051.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_aff3132ff1954ebd9bd2a2b9c284c783.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_b162270b6aef4a9f87d0f059a7115e20.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_f9cd9677bffe420680074555b76d1219.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/apes_movie_free.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_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 4984 bytes
SHA-256: 88b0201bb557aaeb25ca7f9510c5310d22c81bed0d0dcb8cf66b567556b2816f
font_01_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 10936 bytes
SHA-256: 012bb3e0c760be3a0a7c1f3ac2328f3ab6691bb279e9a4ebcf14803c44a6fb45