Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3316b3ea6cd36a…

MALICIOUS

PDF

80.7 KB Created: 2021-03-30 15:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b00e6414a82d277de947987f3e45dc8 SHA-1: bb76e2e170a5bece0930b8e2087f23e2159c0295 SHA-256: ca3316b3ea6cd36adcd6e834e77aabffa26b587e6c52001e365f8b475ff859a6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a T1059.007 (JavaScript) technique if any of these links lead to malicious JavaScript execution, or T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/award?keyword=barthes+from+work+to+text+analysis+pdf PDF link annotation
    • http://tafuvomilo.22web.org/fefanofelugexuz.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/la_problmatique_de_l_adquation_formation_emploi.pdfIn PDF document text
    • http://zufudaduj.iblogger.org/93155050835.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/avocent_dsr2020_manual.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/biology_book_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvugogab.epizy.com/developing_tactics_for_listening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d090c256-a0ad-4923-ba3f-1309fac35473/did_dish_network_increase_prices.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_fbc6b67896204bb59e8634ca6fb5fff1.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_b7987d66f7ed482389211fd491c87c9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de538bb9-9a82-466d-99f2-349506e050f1/what_channel_is_kxan_on_dish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b9fc2d-3627-47ba-9616-fc45143f1500/88966206705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e72a21-267b-423d-b5d1-eebff0fc25cf/top_notch_fundamentals_b_workbook_answer_key.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_045e5756a7c04ac3a897b78de465aef6.pdf?index=trueIn PDF document text
    • http://zezazemana.epizy.com/journaux_algeriens_en_aujourd_hui.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0139aae2-a98d-44e1-aaac-d2cb8117efa6/42289894941.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ae6ad4f4a92a4455a7132e49faeb28d3.pdf?index=trueIn PDF document text
    • http://dowijasimenazo.epizy.com/90300705671.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/possessive_pronouns_worksheet_for_beginners.pdfIn PDF document text
    • http://dugoneluxokudu.rf.gd/seismic_data_analysis_yilmaz_free.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/gijadopuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c1214b-8aef-4aee-ace8-7bd7abdaef97/sasene.pdfIn PDF document text
    • http://fuvafajof.rf.gd/wukagunute.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_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 5656 bytes
SHA-256: 3af01608ebbd426c3813c7b372a3751cb95e18138fdef93db6640e08555b1747
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 10984 bytes
SHA-256: f93b500004fa8862f58bf8a7aa08439ece03484f927622ed022a82d906c6e7d6