Malicious PDF — malware analysis report

Static analysis result for SHA-256 1820c39ae0e16b99…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 01:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 262beb80f0711045320ed12309e59b93 SHA-1: 29bec2d94a9691f7d10ba694f015c3d303f4517a SHA-256: 1820c39ae0e16b994b9d9532c99c79887448e8fbcc7e46991b792509c4080b45
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'worksheet-download', reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=six+minute+audience-analysis-worksheet-download PDF link annotation
    • https://cdn.sqhk.co/nilimijano/cjdRVje/vokadekenipixegunemuxopa.pdfIn PDF document text
    • http://talemine.getenjoyment.net/html_to_converter_c_open_source.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/gj9gehj/injustice_gods_among_us_ultimate_edition_free_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/govibabika/1idOhio/ancient_rome_battle_sites_map.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/hgdBIQo/download_gang_clash_mod_apk_revdl.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/67107003186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5fcf46ffe1d50.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/LYhiji2/66532792624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_6041330bc1498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380086/normal_5fe4271b00c17.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/washington_gas_bill_mailing_address.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
    • https://s3.amazonaws.com/gedexim/asp.net_mvc_dropdownlist_set_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7788b8-ae3c-4e90-b3a6-bf9cfc5d877b/how_do_you_move_a_scissor_lift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a6c01a-a5a0-431f-88db-e349c012b57c/wujawusex.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/o_positive_blood_group_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/50915256012.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/airbrush_old_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/icimod_report_2018.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/vocabulary_workshop_level_d_unit_6_antonyms_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/vudopajovarupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab0a257-dc22-4121-9f6f-ff7e23543b10/how_to_reset_a_kindle_fire_that_wont_turn_on.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_c74b54cd354c4da782987e951f07fc6b.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_27c76c3f6f3744f5b636e9dbcb2b2437.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5524 bytes
SHA-256: 49f009e2432868f369648c28d2ab0b54e09f60d7c7604a4205fd22cbf533a351
font_01_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 10500 bytes
SHA-256: d01d4680dcb5ebad3a4c0521f782b88a2f376f39c2d7d0162b1d76d4435d3b51
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c