Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3b5610d9c7640a…

MALICIOUS

PDF

88.7 KB Created: 2021-03-18 20:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e50ec50c6d37355b27cdbc31c5f574b7 SHA-1: 9218559d947b2e8e8cf98aba43ce9a0379dcc748 SHA-256: 2c3b5610d9c7640ab36ae4b08134782b29ac111f9af9cfe170585561d3c95a7a
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 0.9994

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://gimoguvi.ru/strik?utm_term=how+to+turn+on+ritetemp+thermostat PDF link annotation
    • https://cdn.sqhk.co/mugegiduveb/bvljgih/at_t_u_verse_channel_package_prices.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5ff9f86f5b606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fcb6001b85b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_5ff2ad42355b4.pdfIn PDF document text
    • http://jidojagijubu.iblogger.org/what_is_the_geometry_around_the_carbonyl_group_different_from_the_geometry.pdfIn PDF document text
    • http://xisemakixadaj.iblogger.org/rerut.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/mujefutore.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/idSihge/duck_duck_goose_games_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/0jdibgf/fitbit_sense_bands_compatible_with_versa_2.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/xibomuninewebojobiwes.pdfIn PDF document text
    • https://cdn.sqhk.co/wevosevob/Xfhfhhv/imagining_argentina_parents_guide.pdfIn PDF document text
    • http://vedoluzomo.iblogger.org/alias_grace_imdb_parents_guide.pdfIn PDF document text
    • http://biparajakoji.22web.org/ffxiv_agrias_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kiluwemu.rf.gd/18357189472.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/how_to_look_up_my_drivers_license_number_online.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_153a7b0d52d8476f8a0aa762c5556464.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_d05136512b2e4ebb99681a1281298e70.pdf?index=trueIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_ce2708e3fa9743cdba3b80db70370fe5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/certificate_of_excellence_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/sapphire_pakistan_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/nadofozipogenomer.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_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 4964 bytes
SHA-256: 85bbce10e4de94ce7e4630f159e33c3ff1c74e57d41662308e223703ebe42ab2
font_01_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 11352 bytes
SHA-256: 70af04d5ed0f0f34b544f4a938b817260687a25599a57476b01ba13e0b8b8aea
font_02_sfnt_off000146d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176