Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be90fb043020cf5…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 09:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b9913284b4f78069f966f827ced9a481 SHA-1: 1d279bb85a97dc9687b4cd5daec20c7217b74025 SHA-256: 7be90fb043020cf5baeed3643c4926dc26255a35deb50fa9ef5287485403cb73
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=san+antonio+taft+high+school+baseball PDF link annotation
    • http://wasegulom.mygamesonline.org/abbyy_transformer_download_free.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/cab5a0890e0e.pdfIn PDF document text
    • http://kuximuvup.iblogger.org/ciaphas_cain_hero_of_the_imperium.pdfIn PDF document text
    • http://nudekebe.iblogger.org/easy_duplicate_finder_license_key_free_download.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/10673952481.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/9781619.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/vubizutef.pdfIn PDF document text
    • http://leledup.mypressonline.com/how_to_clean_air_filter_in_lawn_mower.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/4745399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visejatuvun.rf.gd/zapapanibemeke.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_3cdd0858a36f446f99e45c150d05d9b5.pdf?index=trueIn PDF document text
    • http://fepetixapokurob.myartsonline.com/the_stranger_albert_camus_audiobook_free.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_1a9ca94d694f408a9fa9e50d52872b00.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_ee81cc50e91c46c2a798a0377dc944aa.pdf?index=trueIn PDF document text
    • http://lanutovomet.epizy.com/creepy_piano_sheet_music_easy.pdfIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_455abbc5372f496d914e2e4248aee54d.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_1217f4b0435447bd891357ea4be32378.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_06dc99e65e334a97a9fb884ad39ed96c.pdf?index=trueIn PDF document text
    • http://xitiwefebulu.rf.gd/dotiwigisekimaxu.pdfIn PDF document text
    • http://bumupumelagel.epizy.com/xasasizix.pdfIn PDF document text
    • http://rikesugimekezul.epizy.com/concluding_sentence_worksheet.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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5292 bytes
SHA-256: 399344513aba7205c40211bfc6ad6e7816e6f5f119a98a2ec2b3612f40346d50
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 12004 bytes
SHA-256: 820961068910fbe08179dc807cc118890dfa4b79600f996ab2db7f8fdde1d0fa

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