Malicious PDF — malware analysis report

Static analysis result for SHA-256 55874afd31b3dbd0…

MALICIOUS

PDF

85.7 KB Created: 2021-05-16 08:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fe536536ccded6b6efb146973d71f39b SHA-1: 1d0ab0cfb211d5ea32752b0820fc6de752e0807d SHA-256: 55874afd31b3dbd04c13724073aea039fd511bbcc7dd9deca2f4f44b06dd764e
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 0.9997

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/strik?utm_term=fe+mechanical+review+manual+2020+pdf PDF link annotation
    • http://azalea.store/wesuwejosudofosuzasezjrsp.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/tepaxusaxawibo-linasogosi.pdfIn PDF document text
    • http://relax35.ru/kenmore_gas_stove_oven_light_stays_onkdh4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_606b2e3fae3b6.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/25d7f6b088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_603e37ab58752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5feb081330ce3.pdfIn PDF document text
    • https://pufotesur.weebly.com/uploads/1/3/1/3/131378771/3771145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_604ee9a198aea.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/allan_mckay_fireball_free_downloadks9ru.pdfIn PDF document text
    • https://berajodisi.weebly.com/uploads/1/3/4/6/134651265/nutatekapi.pdfIn PDF document text
    • http://lesantyqas.online/satilobirakufevr64t2.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/7d1f7.pdfIn PDF document text
    • http://cuzinfo.ru/85423795416virsa.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/muvadejevopina_pevedizuwuput_megexageti.pdfIn PDF document text
    • http://wwbook.org/zubasit8rs8g.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/biodata_form_philippines.pdfIn PDF document text
    • http://nikecortez.net/23708767347x2m3i.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://jarepumemaxi.onlinewebshop.net/upper_limb_nerves_anatomy.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/who_invented_the_first_steam_train_in_victorian_times.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_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 5292 bytes
SHA-256: 3a9eef52c152b27fd2641fd18593ddf4f1eecd54d764a8ac85e63f216e9dba5d
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 11304 bytes
SHA-256: e35e4c523efe3055bfdccb9cb0a232d0d92ee5e32d0d14b196c9e5b5336abeff
font_02_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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