Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c9fdd9f1e3e1aa…

MALICIOUS

PDF

88.3 KB Created: 2021-04-07 04:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c39b311a530c98b9283a13e740f9b4b5 SHA-1: ee2c43be6a7993f2c323bc74ea6fd942c52e9338 SHA-256: 31c9fdd9f1e3e1aa9d6eeab2b275330f856a90abe47f3dea6f0aca30414e2558
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to malicious sites, likely as part of a phishing campaign.

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://pelibifir.ru/strik?utm_term=acer+aspire+v5-571p PDF link annotation
    • http://pabakijizozid.iblogger.org/zifumoxotadudif.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/who_was_helen_keller_gare_thompson.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/renavuleriwakun.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/stannah_lifts_fault_codes.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/antenna_theory_fundamentals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/94458181-f60f-4d1e-9552-d53d3e8620ab/graphic_logo_design_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca534533-f883-4981-a110-9eb298198122/xibuxuxotumeros.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/apprendre_l_anglais_150_anglais_phrases_pour_les_dbutants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34010480-430a-4168-a70e-94cde56dd739/75516881726.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_8697b4330d7746b5bf363eaa29a2312b.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_e222b21673b54092b0645350c2af869c.pdf?index=trueIn PDF document text
    • http://kewetanetoza.atwebpages.com/87918696207.pdfIn PDF document text
    • http://jabaved.epizy.com/free_twitter_app_for_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d394a707-9308-4419-bcfc-f44094e97c9b/soar_con_dientes_que_se_caen_significado.pdfIn PDF document text
    • http://zovixiluru.epizy.com/reburonebawud.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_65f720322565406d842706d360e1094e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84dd429f-f199-4c4d-ad34-018121769cef/how_to_turn_heat_on_fujitsu_mini_split.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae8252a-d9dd-4ee8-abf1-1eafc689056b/8836294401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a69b18-61e6-4994-a24a-e7e6e3388f57/salicylic_acid_cleanser_fragrance_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a664ed3c-00f7-49a2-b59b-1cd029488fe5/47887858379.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/zosofixobefuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c54ae4e-91dd-4b5e-a697-0de29301ae50/87370753725.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 5232 bytes
SHA-256: 6ee24cf766ec41c9ed5bc0360766bafe6dbadb1a4bb8fd3b8a8ad4135df37b88
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 11228 bytes
SHA-256: 94069e81e7f12008c56e0806ac1e430c799f12aaeaae00a0ce1d99e592095c54
font_02_sfnt_off00013203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13203 10904 bytes
SHA-256: 700b7849d4a5db088909080756b60ebc22636d6db98dd7eec3ebbc543e44dae5

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