Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b88747fba9c71d…

MALICIOUS

PDF

101.3 KB Created: 2021-04-28 07:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9e6b5bdc9c69c36c72208f4b005793e8 SHA-1: 984f28b31bca270a72edf145c0285791998a2709 SHA-256: 86b88747fba9c71d6ebbceb333f3f7795f15854c156b88c6b08cb8c33681dd40
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=call+of+cthulhu+7th+edition+keeper+rulebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375884/normal_605dced45e280.pdfIn PDF document text
    • http://enots.space/abbey_glover_please_don_t_got7rpk.pdfIn PDF document text
    • http://pixell.store/silent_love_song_punjabiiuyhe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fd604a835efc.pdfIn PDF document text
    • http://hookup681.site/tapugihkcvm.pdfIn PDF document text
    • http://prequester.online/26028077308jjqyc.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/la_pelicula_de_scarface_tony_montana_completaap2qb.pdfIn PDF document text
    • http://pycnidwzxc.info/833391175407m3ub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fdcb789dda8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_60397183674cf.pdfIn PDF document text
    • http://mastera-saydinga.ru/4592787252c0r6b.pdfIn PDF document text
    • http://weareanonymous.org/52359469654zj95.pdfIn PDF document text
    • http://chambrehq.xyz/flat_stanley_books_in_orderavcml.pdfIn PDF document text
    • http://lulelege.iblogger.org/oregon_blm_map.pdfIn PDF document text
    • http://skameyki.club/84332450599g4u1v.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://s3.amazonaws.com/sajatofubote/vectors_in_three_dimensional_space_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/the_way_we_eat_now_goodreads.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/defining_deviancy_down_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/ginixuvojedomuro.pdfIn PDF document text
    • http://xojabujujipeze.rf.gd/kexexirukoremu.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/wubewawavumavimasa.pdfIn PDF document text
    • http://mopunetite.epizy.com/samsung_galaxy_s5_att_unlock_bootloader.pdfIn PDF document text
    • http://tojegazanet.rf.gd/55153350078.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_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 5256 bytes
SHA-256: b091d90dbe3d45f3dca6a2422d4460b8e54a97b0727923c48b4adb21ab0fa964
font_01_sfnt_off000151ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151ED 11520 bytes
SHA-256: 01572a5435358c72ce69792bb6068a24d207bf32a09d491b97486ac7e301f10e
font_02_sfnt_off000178f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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