Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c8ce36796900a8…

MALICIOUS

PDF

69.9 KB Created: 2021-03-23 21:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eabce053e98271da61974d0a66b014cc SHA-1: 9cf6ffb2b3673e664bdf0b5f9e6b5abe44ea7bd0 SHA-256: 44c8ce36796900a8678f6696d131fdb2b7c54bee479beb679c11c01fb2f89552
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 manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially using JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=the+age+of+imperialism+dbq+answers PDF link annotation
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/nivuwutukuroj_vejijalif_rarime.pdfIn PDF document text
    • http://ridegibulas.22web.org/2019_tamil_movies_video_songs_isaimini._com.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/2938209.pdfIn PDF document text
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/riniwitikemepax_norepako_lokipidusonix.pdfIn PDF document text
    • https://pimefukidipobe.weebly.com/uploads/1/3/4/0/134096137/b5123.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/78b0d5f6b6aa7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/ZbKNUwH/taxubo.pdfIn PDF document text
    • http://hamsterbig.com/cant_get_my_wireless_mouse_to_workoi8fb.pdfIn PDF document text
    • http://smcjd.com/introduction_to_structural_dynamics_and_aeroelasticity_solution_manual3t79h.pdfIn PDF document text
    • http://mylic.ru/snark_hz-1_tuner_review6wnbg.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/jgp4hfh/castle_farms_concerts.pdfIn PDF document text
    • https://cdn.sqhk.co/mapuvokunoj/bhbTijI/46740785907.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://mitudosukekunif.epizy.com/paneresupapasusisetugakib.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/australias_own_weber_q_cookbook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/wastewater_treatment_process_modeling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04765279-2f47-4fee-99fc-b062764c415e/senawowit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff629e3-e12b-40a3-96b3-c941e8d08255/synonyms_worksheet_3rd_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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 5472 bytes
SHA-256: b77f737b83ef013d820b47f2faeeee2bab3cb88519dd8fd33a1199cc0361fb4c
font_01_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 9816 bytes
SHA-256: d13f1d7afb68a5642d5f5553f27cc88f031dfdf43623d6eeeae1461f913cfd69
font_02_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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