Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b3e3550ed89fe4…

MALICIOUS

PDF

78.9 KB Created: 2021-04-10 10:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c815f7ac323cf7fc7aa0c22b30ab1e25 SHA-1: 8c0aafeb9a888d2fba0c96a8cc4ec9a1e09153f7 SHA-256: 26b3e3550ed89fe4bb1e4edcd4ae26ee9fe066334447bacaa3b528ed47bcf2e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://vilenefex.ru/strik?utm_term=home+touch+steamer+not+working PDF link annotation
    • http://tersq.space/writing_in_the_biological_sciences_hofmann9tfv3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_600fe464e0aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_60540ff0cd1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_601b46c5c14b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_602a25443adae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fe5b80595a7d.pdfIn PDF document text
    • http://afracheat7.xyz/simile_and_metaphor_worksheets_free9n6n5.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/warframe_unvaulted_primes9ivhv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_60414f0149f8d.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/zutazab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_603f85a09eb74.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/physical_health_and_mental_health.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5fe0531dca48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_600b2a75e11be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_6011df4f6f9e5.pdfIn PDF document text
    • http://vsedlyatebya.xyz/drawing_and_designuo7j0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dac0f52-438b-4b9a-93b1-555b8239c448/vuriwofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d582a1e-ec7d-4a54-b5a8-59f524f870b0/sims_4_patch_update_november_2020_broken_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8415a32f-ac80-42a6-bcba-0757cff74748/lanewod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea1ff69-a313-4383-97a4-e2ea82c6bef9/what_are_the_benefits_of_tai_chi_and_qigong.pdfIn PDF document text
    • http://kexomun.myartsonline.com/nolewagexuxogapas.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/how_to_connect_anker_soundsync_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab6a2a8-664e-4d03-9baa-5253ca449923/larijanisuwadaxugi.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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 5296 bytes
SHA-256: 0633b83ab500e053c60154e6ef666fc0f2e0f133aa70bbb8afff049669950dad
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 11144 bytes
SHA-256: e2592fbe036e9d46091493ea9e94fcc37a42c129ff975183395e105b909e5dcb

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