Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c9875941fe6279…

MALICIOUS

PDF

76.5 KB Created: 2021-04-09 07:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b09f3e53418921b753a0b6e4e52f92d4 SHA-1: 24f717e8ef7c4018d5db0d51ccc9a4e83abf1823 SHA-256: 81c9875941fe627940f23a7162a6e75206a576ab569c0d192dad18c98ecefdc0
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 spam operation. The primary URL, 'https://pelibifir.ru/strik?utm_term=how+often+should+you+change+transmission+fluid+in+honda+pilot', is presented as a search result, indicating a lure to drive traffic to potentially malicious or deceptive content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=how+often+should+you+change+transmission+fluid+in+honda+pilot PDF link annotation
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/6026570.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/858cb823110b.pdfIn PDF document text
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/8180869.pdfIn PDF document text
    • http://kavekigikekilub.iblogger.org/70237629623.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/gikitubil.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/5673366.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonuwufif.epizy.com/pixawur.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_36fce9c90f47486583a212f51775efa1.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_da62f8c4b98b4f39b77150905087373e.pdf?index=trueIn PDF document text
    • http://xanojeja.rf.gd/harvard_affirmative_action_decision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70db0969-1c7d-4b57-928e-c1c6b9fee22d/separuzajaxagasosozafa.pdfIn PDF document text
    • http://nemunuj.rf.gd/bj_s_brewhouse_menu_nutritional_information.pdfIn PDF document text
    • http://nanoxamovafosox.epizy.com/gebusufogozusojazesodol.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_9e1201f007f34c7aa32f9eda731d3475.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1468b403-1717-4030-965c-be3bb6621fdb/85620583205.pdfIn PDF document text
    • http://sapimidogiraja.rf.gd/sequence_and_series_bansal_classes.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_22e087afe7e54dc48d95a65c09dfb03e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fc47b0-c01b-4619-9537-82d202b1ef1e/gunewulezefodosaxobavijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083bbf43-6359-48ef-9c75-8f7604548a94/64139884418.pdfIn PDF document text
    • http://ligirewela.epizy.com/24873966944.pdfIn PDF document text
    • http://xonesopidazuju.epizy.com/65635932486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6435864-a9ef-4545-b1da-87509acc1f09/turudarizizenawe.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_2236a8b9f3f145bbadcb4d90bf5a5281.pdf?index=trueIn PDF document text
    • http://mixaluzosibad.rf.gd/fitbit_versa_lite_bands_canada.pdfIn PDF document text
    • http://mamotipovefo.rf.gd/928676290.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 5724 bytes
SHA-256: 993fa028dfaf834f38a34ac31efa206832902e161e746eb78922004235d3cc2c
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 10392 bytes
SHA-256: a5e5a3e3b95a91d8a11839efbe86a30eae1daec76bec54285538b5b9af1d85c7