Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8e4fa8ae172a1…

MALICIOUS

PDF

83.6 KB Created: 2021-05-13 10:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a875d940050237770475f29c6db5d3f3 SHA-1: 74466c625f0dd620566086455bf769cf781147b5 SHA-256: 82d8e4fa8ae172a1df28ab5da85f9ed2a2ce00729aae6d86beb5fce7fe78a806
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=washington+museums+opening+hours PDF link annotation
    • http://hugertely.xyz/nifitavilsrt37.pdfIn PDF document text
    • http://file-id.ru/sifolulasobi0skqt.pdfIn PDF document text
    • http://devgm.design/mopuxinubapifemebbyf7.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/4jfhijh/zipozufaxolotilojirugopak.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/agheghm/11399246223.pdfIn PDF document text
    • https://cdn.sqhk.co/miseseren/digcjgt/25627119006.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/cjf2ifd/63083050378.pdfIn PDF document text
    • http://all-system7.club/5_year_plan_template_powerpointpcdya.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bozitelededenox.epizy.com/calibres_de_balas.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_e98f1c01e89b4cb499ea5a3467f4f9f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb238a54-5e08-452b-af01-f8f1c97f2fb6/sizuzakobilawojavukinus.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_ab0c296fc1b841f188cd293b9dc3e80e.pdf?index=trueIn PDF document text
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_21c2472d3ee74c318ec303f1841b16f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a152c41-3d8f-4dbf-a047-4c6e12bd3ec7/what_are_the_community_needs_assessment_process.pdfIn PDF document text
    • http://tovetetuw.rf.gd/la_poetica_di_aristotele_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6c5d9e-79e9-4147-9eef-234e75813768/connecticut_dmv_manual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba53e4e7-1929-4823-9349-4d342bc5b84e/how_long_do_you_cook_a_half_ham_in_the_oven.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_ebafdeaefc994c729fe6d5dce116d691.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/715ef878-b9ff-42aa-8a01-1f9222da16e2/6973183407.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_ad8a49ae681144898ddfa4100382f12a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/005fcb46-ef05-461b-99cc-7c80a67700fe/how_to_analyze_graphs_of_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa665433-9ad8-4141-ae5a-6ad4a65cbbdc/personal_narrative_essay_examples_5th_grade.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_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 5096 bytes
SHA-256: 99cb10b114f543d0f74c1e0b1722083eee0e877c1a69f6f77fdd9f82d8b207f2
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 10804 bytes
SHA-256: 4f20821ad5cac569f9814897094ef8ad10aa74f59af66ef83aad263c26c7e4f2
font_02_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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