Malicious PDF — malware analysis report

Static analysis result for SHA-256 646f3a747a659e3d…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 07:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee98d1c138bedeef64d91611d4922dd9 SHA-1: 980deb4172e68b577413d4feb65d6955229eaa66 SHA-256: 646f3a747a659e3dfe78f935d1dcc3aca79a89a6a49dafeb442f1a9bfa87bc3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/aws?utm_term=how+to+transfer+music+to+sandisk+clip+sport+plus PDF link annotation
    • https://mojibivod.weebly.com/uploads/1/3/4/4/134490358/badamipigivix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_6043053f83d24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_60073b4342ea4.pdfIn PDF document text
    • http://bimejug.iblogger.org/13557171386.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/dewefap-wuxalubewiri-lafalivom.pdfIn PDF document text
    • http://pimolala.22web.org/2009_gmc_acadia_manual_liftgate_problems.pdfIn PDF document text
    • https://komipakokituk.weebly.com/uploads/1/3/5/9/135993761/kewuvuxupako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_6040c42646aaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421623/normal_5fde9db4b39df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_5fcff740b2dbf.pdfIn PDF document text
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/fccd6c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_5ffbde8636c76.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/mokuwanibof/abyssal_commander_sivara_lfr_guide.pdfIn PDF document text
    • http://sogigadataga.epizy.com/26483330502.pdfIn PDF document text
    • http://gugigiser.rf.gd/astral_upvc_pipes_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/what_to_do_for_a_callus_on_your_toe.pdfIn PDF document text
    • http://sogigadataga.epizy.com/38130157128.pdfIn PDF document text
    • http://jipuseri.rf.gd/vasawufel.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/lilik.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/why_do_african_nations_have_so_many_civil_wars.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/zebra_danio_care_sheet.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 5416 bytes
SHA-256: efbd0367441724f147b6e1cb43622357b27affd82e25f6fb77afdc2fa2f557e7
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11112 bytes
SHA-256: b6e8d4449674f91073ecbfbd51e1f4fb2d65ee3c40187f384858213125578b7c

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