Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c81bc844723008…

MALICIOUS

PDF

81.3 KB Created: 2021-06-04 11:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3586f66e2b69459bac482553e7c7e65e SHA-1: 751a51cd2f34eebc1ed7ca638fe435fc767b3835 SHA-256: 44c81bc8447230086c50700f502be924ca38a11c24ffc0bcdc9c2b3c4918d5a0
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 0.9998

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://seumenha.ru/123?utm_term=non-+binding+term+sheet+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450634/normal_601531c7d027d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4505699/normal_60b6db07eb87f.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/kasikutejapazufik.pdfIn PDF document text
    • https://wotixefutakit.weebly.com/uploads/1/3/2/8/132815753/1617264.pdfIn PDF document text
    • https://juludonidodag.weebly.com/uploads/1/3/4/7/134706402/3e636b0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fdd76d0b9f56.pdfIn PDF document text
    • https://kivupopemuti.weebly.com/uploads/1/3/4/3/134318129/4864088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_6068d17ac7040.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/59836000-5e07-4e82-8233-aae70cbe9802/japurigufosunogewetut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60d1885-4456-49f6-8f77-9f2ea487fc57/how_to_use_bissell_proheat_2x_carpet_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b34ee31-115f-4785-9363-8b37ff36d5bb/ejemplos_de_binomios_al_cubo_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a224eba3-afb2-4cdb-8fac-8a83e7ebdcbb/linksys_wrt120n_default_user_and_password.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/46419293423.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/mashiro_no_oto_setsu_a_love_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8294eb0d-3c8e-414d-b859-3eb3c04182be/ev_charging_station_type_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b35476-59f7-48c2-a51f-6066dd8dfa1d/epson_artisan_800_ink_walmart.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412404/kaletajoruduwaxotekego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686eb9eb-0621-4a43-b609-a44d54265803/beats_by_dre_wireless_earbuds_troubleshooting.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144543966/market_entry_strategy_plan_template.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_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 5220 bytes
SHA-256: 6d18abaf7bb526fa764799345cb744c95afd824f2b0b2e1fc0a9de324df23292
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 11572 bytes
SHA-256: 10268a2032cd37568dc4cbe2436603a29552fd290512da175600383739d98cc5

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