Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f8de485de5d3c…

MALICIOUS

PDF

83.0 KB Created: 2021-03-22 15:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 32f780f6e56f682873690e9bdc7dbb2e SHA-1: 849be377a162d7f03586aa1e2ddaf1cb047042f4 SHA-256: 638f8de485de5d3cd90e2b465bf206b402227751c1662cda57949adf9aaf48d8
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://druttle.ru/wix?keyword=bdo+bartali+guide+1-10 PDF link annotation
    • https://cdn.sqhk.co/xusozapovu/PTyijmh/magic_pan_ice_cream_roll_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/ah5N2ig/super_fast_drift_trike.pdfIn PDF document text
    • https://cdn.sqhk.co/fetesulatol/jdjgghC/eso_maelstrom_arena_veteran_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/oZcb9vl/27268408667.pdfIn PDF document text
    • http://zomosidotewe.sportsontheweb.net/jorukodekoxidejipuxo.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/12609185310.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/iACjfhi/14298457116.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/ihhijKi/auto_reply_text_app_for_android.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/avishai_cohen_seven_seas.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/q20hdic/mountain_car_drive_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/melobokodijo/dbOwWXI/volume_booster_pro_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/bUieXjg/fikanov.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/iijjjge/86047469141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_59150d8caa8a4e27ac416fc1231552f6.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/alpha_glucosidase_inhibition_assay.pdfIn PDF document text
    • https://f2182bdb-ca8e-4fe7-b379-f84e14eeb57e.filesusr.com/ugd/026bcc_a53d6579b5d14ee7a2a411ef71149e32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/aiag_fmea_manual_5th_edition_ppt.pdfIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_00b10e19bcd54e8e9bb2f1a0f4276e48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/niranepivoles.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_39e1736c86d0418f924cd55c6f2ddf3a.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_381c186b085a4f2396fcec80b926f4b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/how_many_covid_19_in_el_paso_today.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_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 5228 bytes
SHA-256: 4f272130baa94639750541dd0e493fee9f2d17db3a00ce0a06e566aa935e244c
font_01_sfnt_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 11644 bytes
SHA-256: a35ef6fd9611008dace75a1204392dbfc52e2476e2d97aad5d1a1882adfdfea2

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