Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a975af8b109952c…

MALICIOUS

PDF

77.0 KB Created: 2021-06-06 21:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26d085610016978ab9493639dc879458 SHA-1: 51063f368ec95ca18e6ca9fadc59ab156f879589 SHA-256: 2a975af8b109952c9f64c3cce969e9d198defa1e38376c046654af710e065b6f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO spam or phishing campaigns. The presence of these links suggests the document is designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=exponential+decay+word+problems+worksheet PDF link annotation
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/1348142.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/47a5ee9.pdfIn PDF document text
    • https://zefodikibaxamot.weebly.com/uploads/1/3/0/8/130814254/kugedaposiz-taxaba-jorigej.pdfIn PDF document text
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/fujuvuvosolokibeneja.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/5064150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6018cc913a072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_6015057b817ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_60506a159fba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_60bb60aa1de10.pdfIn PDF document text
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/b0d21a1f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_600b6ac7e5ec8.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/9ef5d23990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_604343d440629.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/tusodirekebojo.pdfIn PDF document text
    • https://vopovotapo.weebly.com/uploads/1/3/5/3/135324672/6107859.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/5216754.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/fododot_fopaj_lujabigave_wikisid.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/9460663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_6038730d0c0ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitilabajeko.pbworks.com/w/file/fetch/144724599/wondershare_filmora_9_effects_pack_free_download.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/51294635211.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/how_to_get_hacked_battle_cats_on_iphone.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_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5736 bytes
SHA-256: ee677082ef8aa665bf4d8c9b88de76c9ba7b5d3e385fb7be1e1cd48135659384
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 11896 bytes
SHA-256: 64f45c6ad609fe41b91570cf88fc2a2d70a72331592475a871d619ae5439bab7