Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e965caaff00f3f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 05:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2aaed14d7b77630958b673f0135d8eed SHA-1: 4643036aca9842c7d590b22e0dd8bcbea7e74eca SHA-256: 51e965caaff00f3fda29de5fc745f3f32726eb0d9a81d2305695fc7a9ac7ffec
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 pointing to disposable domains and potentially malicious hosting, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV also detected this as Pdf.Phishing.Trojan. The embedded URLs and link farm structure suggest an attempt to direct users to malicious sites, possibly for phishing or malware distribution.

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://midufefew.ru/123?utm_term=artichoke+heart+nutrition+information PDF link annotation
    • https://cdn.sqhk.co/kixarozikej/jdhgidQ/best_potential_players_fifa_20.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/YjhQ1if/59933634114.pdfIn PDF document text
    • http://summer-italy.fun/jot2_task_2xomjv.pdfIn PDF document text
    • http://rodina38.ru/gobazajuj3g577.pdfIn PDF document text
    • http://goodsfor.life/xezimumexowasinatuzazhlle.pdfIn PDF document text
    • http://zozagibewaxi.iblogger.org/amarna_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/ifghqjg/41525717026.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/fhjeSRT/dave_dangerous_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/Pgyibij/57266907962.pdfIn PDF document text
    • https://cdn.sqhk.co/govupasuti/lojajeh/zataxutatowapoforeraji.pdfIn PDF document text
    • https://cdn.sqhk.co/bopopujag/giid5gf/craftsman_golf_headcovers_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxazulofonu.epizy.com/zuvamudijujokibej.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_c5821ec7bea7499d920065ebd695700a.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_556c7593f7394bdc9a04af0c1b8adfc3.pdf?index=trueIn PDF document text
    • http://redikubegoda.epizy.com/xodos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c990e888-b80c-41ee-8767-35b15737149e/kebopot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cc0298-878f-4f62-9c05-616203a1bcae/how_to_use_nespresso_vertuoline_plus.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_8a9b2d5e54474db28eabbe5c7b6dc858.pdf?index=trueIn 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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 4964 bytes
SHA-256: 391a457353f168773048337e452818037ce5f2c78e68f9bf2d2be99ae9312920
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10824 bytes
SHA-256: 5caa33c5e91174f328b9f587070bfa1b01687ddfc3cc77384e0f982da1d3389a

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