Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb13f943eb72edc…

MALICIOUS

PDF

74.7 KB Created: 2021-06-08 17:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 32e38c0cbc5273a052f1a08900b9200d SHA-1: cea1e2cbc424697adef44c8785eaf6a25fb83354 SHA-256: 7bb13f943eb72edcc056b3c04b08be435ddb7078c5db4990bff582a74732f25a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://synerhu.ru/pbw?utm_term=guia+abdominales+hipopresivos+pdf', is likely part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://synerhu.ru/pbw?utm_term=guia+abdominales+hipopresivos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378857/normal_6064f2f455d35.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/xofikarasigixowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5ffaac1c4b265.pdfIn PDF document text
    • https://zijisejimalunu.weebly.com/uploads/1/3/4/4/134495917/c879b8ee9.pdfIn PDF document text
    • https://wojipinokogax.weebly.com/uploads/1/3/4/8/134863097/zexazovalufibax.pdfIn PDF document text
    • https://kaxemesotom.weebly.com/uploads/1/3/4/7/134732336/6054055.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/kovademijapaf-dimumo.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/8267870.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/musikimosob.pdfIn PDF document text
    • https://ruzovaberup.weebly.com/uploads/1/3/4/6/134651658/dd7d3.pdfIn PDF document text
    • https://fogepiwutakeru.weebly.com/uploads/1/3/2/3/132302718/4802896.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/7189922.pdfIn PDF document text
    • https://xukokamil.weebly.com/uploads/1/3/4/3/134317204/revabikirin.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/97b3c5a8-2bfe-4e71-bb1f-4abeba007a70/simple_wooden_rubber_band_gun_plans.pdfIn PDF document text
    • http://gebozuj.pbworks.com/w/file/fetch/144855747/19904543045.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144474399/15474369831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d09ee17-f5f8-459e-abfc-b5a2bbb9f5db/fidelity_warranty_services_cancellation_form.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144583377/ads_sensitivity_rainbow_six_siege_console.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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 5512 bytes
SHA-256: 5edc64eccb6a2638ec96566221040c99c5782c7247bf127dca67a28f911865b9
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 11756 bytes
SHA-256: 4cec2eb28b69afc217d6c36e6ae460f0183974c3d02b13dea57d006c06858e89

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