Malicious PDF — malware analysis report

Static analysis result for SHA-256 76daba0dd45dcd3f…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 11:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65b43ef7449097d6cffdf21b702ce7c9 SHA-1: 5ad817d48983d382a8cdaa07d66a4b7c88c1e9ca SHA-256: 76daba0dd45dcd3f14c2eb9535d33c3c9f4e0ead7dea2468d345846332c3683e
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 0.9998

Heuristics 6

  • 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 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/award?keyword=cancionero+de+guitarra+pdf PDF link annotation
    • https://lukigozijejis.weebly.com/uploads/1/3/5/3/135398738/3457209.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/Xo3v8ge/akmu_dinosaur_matikiri.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/iiLZUif/75449899146.pdfIn PDF document text
    • https://zafubunemajuz.weebly.com/uploads/1/3/5/3/135314528/c0d5c33db23c.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/kjdNjgU/falling_in_reverse_merch_australia.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/wikatige.pdfIn PDF document text
    • https://cdn.sqhk.co/dowivita/Lq9gcic/mobile_device_helper_parou_de_funcionar.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/dDl7xji/us_box_office_2020_this_week.pdfIn PDF document text
    • https://cdn.sqhk.co/wotinobeb/blEbjiJ/tuxetenokimomejaperusab.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/446060d3617d13.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/do_you_capitalize_graduate_student.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/JjaLhhL/voss_water_glass_bottle_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipemoluligera.myartsonline.com/cessna_421c_poh.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_24f00fa7272047e0a3141d795588d8fe.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_6feaa26122c24accb0913aff8225eafa.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_e122dfad97d24148b1e3f94e6b4c8034.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_e003f47c4739486ca1710fbac614f269.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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 5020 bytes
SHA-256: 185d80fed562e9a2f959e3900e9a54312741fef3e41c64bbd0b8f21b1bfdf806
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 1888 bytes
SHA-256: fb837d8d2e7b6ff876074993d1faa48c00f8652074d5e7b79bdb67b3eeb562c2
font_02_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 12144 bytes
SHA-256: 282d8a5e6d1576998bc3b9c8ae54aad9b0f2002d6072367f890a5666a61e282d

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