Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cf476777830cdb…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 16:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 89eb0b1e347a1b864abb8fc17cb93e02 SHA-1: b3599f9d16b91222d275a78919178c1be3f65430 SHA-256: a6cf476777830cdb90098a0a96f9ae4cfde3f73912633aeff4f47b2c7005a224
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://leonvi.ru/wix?keyword=maytag+centennial+dryer+troubleshooting+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378161/normal_601ee702de5be.pdfIn PDF document text
    • https://gumozudisi.weebly.com/uploads/1/3/0/8/130814032/3037708.pdfIn PDF document text
    • https://zixobidepupakog.weebly.com/uploads/1/3/4/5/134503699/wusemuvovobawi_sadesejuk_kilize_riboropufedojim.pdfIn PDF document text
    • http://muvirire.22web.org/quimica_inorganica_catherine_housecroft_portugues.pdfIn PDF document text
    • http://goodsun.fun/15052126292aj3c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603b661d14f27.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/3750446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_604042e3b403f.pdfIn PDF document text
    • http://com-signto6.xyz/nijofiluzigetifizodofinud7c5an.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6057a98ca479c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_6039a587e7aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5fd261af36759.pdfIn PDF document text
    • http://biomaniks.website/invitation_to_dinner_template_wordingy4gy4.pdfIn PDF document text
    • https://nobepitolixedi.weebly.com/uploads/1/3/4/5/134516182/8412879.pdfIn PDF document text
    • http://republvinb.fun/21749685031sr6a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_60410a478de82.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/4557667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimusozulub.epizy.com/soundtrack_of_the_bourne_ultimatum_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/riselal.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/google_chrome_bug_report.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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 5448 bytes
SHA-256: 646a0654388d8385a589307b2db2bd208739057a772a3291fce13fbbb3ed634b
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 10412 bytes
SHA-256: 9a0f25d9493465bc66b8c87b066de6b0a4517095355b2a53df0b968f57032f25

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