Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c49c47d009e90bf…

MALICIOUS

PDF

99.9 KB Created: 2021-04-23 17:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 095dd57b2bddfc97e7979d16c3c96089 SHA-1: 20f624c6c6d65a58b8522234db4b0eb404e4342c SHA-256: 6c49c47d009e90bfc3d6a3b11ce651934900390934780fa7835e5b5b3b35c368
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 spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gimoguvi.ru/strik?utm_term=the+bloody+chamber PDF link annotation
    • http://apparently-home.com/gurijipuxobiselokovn2h1y.pdfIn PDF document text
    • https://metuwudoguwo.weebly.com/uploads/1/3/5/3/135323448/1228535.pdfIn PDF document text
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/8007066.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/zivesililej-mitama.pdfIn PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/xiwewevonewibe.pdfIn PDF document text
    • http://esportzmlevent.com/epidemiology_beyond_the_basics_third_editionymrd0.pdfIn PDF document text
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/vemasivumapa.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/kapalaposagifdc.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/gasenetav-kerejemo-xevozovono.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/47033993382vqum8.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
    • https://uploads.strikinglycdn.com/files/606cc1e5-5d01-4a1a-b2ba-ecc7019a1305/21288320845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e127aeca-e282-49fe-90d2-0ab23eb5e20b/red_cross_first_aid_training_promotional_code.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/35167589562.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/luwinavaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d74e60e-df22-441b-b308-d08a180fcc83/xing_yi_quan_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/jevixabisororat.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/businessman_full_movie_in_telugu_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bffc732-943f-406a-a678-33c52e27385c/how_did_haiti_get_its_independence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45bbff9-9a07-404c-af45-d77fff225c5b/what_is_patient_autonomy_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/bupopulaxudila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b943fb5-bca7-4da4-889c-02e864049a17/simowelizibodakixujobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ec28b1-2d75-4ec0-bdec-3c5aefa82a60/37330989034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8ccf57-c6a7-496c-b727-eac98c0c6a25/thunderbolt_mini_displayport_to_dvi_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c3c953-5495-4226-8568-0158e50a352d/3476284094.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_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 4748 bytes
SHA-256: e792846308ccbbc337f6045e77450dc845275902bf14d1c650ed8a57253a679d
font_01_sfnt_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 11260 bytes
SHA-256: d70b9e015cef0366610680e256b598ef2057cf4b1179f7d5b7c819323bd305f5
font_02_sfnt_off0001744f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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