Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8880d914aa27c9…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 00:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 22256cbb0d70abfb7d3113c87943e8cd SHA-1: 0f420a55b887811b73cc72edfa851a134a4f59db SHA-256: 3a8880d914aa27c92e3a071c98b34187a0e4b6ad58484d65b0305dbfea3fe699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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/123?utm_term=when+the+camellia+blooms+sub+indo PDF link annotation
    • http://usacreditscore.info/zawasazaletedeguvibirepnart.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/9519631218.pdfIn PDF document text
    • http://gufutaca5.xyz/322914661017j71o.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/extent_report_2._41._2_jar.pdfIn PDF document text
    • http://perfectiona.online/zarifuid0dd.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/jevudowu.pdfIn PDF document text
    • http://carins.info/friendly_letter_template_printableggfik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipijitifexus.epizy.com/apc_smart_ups_1500_battery_light_flashing.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/33025085140.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/boi_star_token_software.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/xinufilakog.pdfIn PDF document text
    • http://tutedenomazul.epizy.com/wonder_zoo_animal_rescue_game_free.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_8f31a2aff69549c69d690ae94f3194fe.pdf?index=trueIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_3efad8fb410e4f3282646b9d0eb494d2.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_df0f4f8444ec4eb2b361aef7a85a8d97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/3408388522.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_56f8e2d00d1a4f93a3b41069ac7922e7.pdf?index=trueIn PDF document text
    • http://gajopule.myartsonline.com/gitudenu.pdfIn PDF document text
    • http://mugevewobota.rf.gd/ge_spacemaker_laundry_replacement_parts.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 3720 bytes
SHA-256: d0ab9f96d31b3d952be250ae9a46310e45596e65661ff8897ac9d56d89b00499
font_01_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 5236 bytes
SHA-256: cc7e2c9666e74b2f81d5f5e0ada8b6090cf5582fb308d15566f517ea2c33fa8d
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 10296 bytes
SHA-256: 348a5c1586f677221380228627a125dfdaf64dd8653f9947680d1e18f8dbfccc

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