Malicious PDF — malware analysis report

Static analysis result for SHA-256 9112823fdfa5f8e4…

MALICIOUS

PDF

70.1 KB Created: 2021-04-01 21:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19fce28854a3270be1992a655e6040b9 SHA-1: c4755a83dd9b91d53f090c38cb67a85e803faf9d SHA-256: 9112823fdfa5f8e4ec3b2482ed71178676d5b235c0147d855b9d9429622f6b63
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The PDF_SEO_LINK_FARM heuristic specifically highlights the mass of external links, suggesting a tactic to distribute malicious content or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=gauge+theory+and+variational+principles+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460251/normal_5ffbc6a04f2a4.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/fulugijivalozamozekevokof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_60521f2121031.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/tawipaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_60329433b8b6e.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/261e041.pdfIn PDF document text
    • https://wufurivukotep.weebly.com/uploads/1/3/4/5/134585879/jijuxepefonipeba.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/a2424fe.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/biwijovode-winelawa.pdfIn PDF document text
    • https://sabigakubotel.weebly.com/uploads/1/3/2/7/132740275/monodeki_miturot_zerozijasemap_tafawale.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/two_sides_of_effective_oral_communication.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/essentials_of_computer_organization_and_architecture_fifth_edition_linda_null_phd.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/nigurometilifuji.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/a2725ab43.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/nawilowujuxuwasur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_c3352d0c90a04b628bbc63f6ecf4b1b1.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_d5e966ac82cc4eb2a1266be3ac1c9832.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/32451000002.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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 5612 bytes
SHA-256: 312b21a73f373a1646d4857ec364a38e150cea3c0556d5c362dad3fed835237a
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10448 bytes
SHA-256: 363ae590d1e3cc799f0ff871164755727a4daa1feaa984132101b54e56b59a13

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