Malicious PDF — malware analysis report

Static analysis result for SHA-256 370f4a96eb6e7358…

MALICIOUS

PDF

67.0 KB Created: 2021-03-25 12:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6d8ff57f7c15500f318641636b0e57d8 SHA-1: af887ec0bbd1e17604a0916b1e8cecc71cfab600 SHA-256: 370f4a96eb6e73589ab25626766af2bda8f77c258347090cdde9ed7d3ab22613
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to trick users into visiting potentially harmful external content.

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://jumiwimov.ru/award?keyword=aw+rp120+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/modajili/0Fz4JP1/drop_it_low_ester_dean_download.pdfIn PDF document text
    • http://helplnstagram-confirm.com/retunagifoxezab8m9be.pdfIn PDF document text
    • https://liwuvena.weebly.com/uploads/1/3/1/3/131398027/jonulunexakogopuriv.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/e1ihhie/word_cash_receipt_template.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/gidjcVy/26886832344.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/1446258.pdfIn PDF document text
    • http://moymagazin.xyz/the_48_laws_of_power_summary_series0rkrr.pdfIn PDF document text
    • http://filanion.online/nissan_xtrail_2011_user_manual2vzlm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_1bf8ee0838294dc5a57bc65b56861267.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_dcfe9f8cdf9f47cdaec62d8382240fea.pdf?index=trueIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_dd7b128ce0874d3cb12ff580e78b30e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/hopak_orchestra_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/dopigimejuvegudepeneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3996f978-c56e-4ede-9b6f-1da186ed3914/rixesato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a640ecf7-3496-4e5f-a010-2822ff03080d/walmart_hours_of_operation_christmas_eve_2020.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_ff08580f1f744f5abdb684fef5d67812.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/vazikineselus.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_off0000ca60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 5416 bytes
SHA-256: a1e310903ea519e406e0d6ce5c78e64cb3f408d4c99f28b359685132c2b882c3
font_01_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 10196 bytes
SHA-256: e9fcc07e77900f57b5a047fc9a4558b2a942b56a1fd48255ceb0aba52e81f6cc

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