Malicious PDF — malware analysis report

Static analysis result for SHA-256 697a98e5d0a7c6ec…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 12:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 167f1f6e19e8e90460457f019380da0a SHA-1: 4021dddd8ba19a11c3064bec250ce954a57be5a4 SHA-256: 697a98e5d0a7c6ec0e0eac168d52ca7bdcef5301fa8d4323393b8b43c2518fbe
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure for further compromise. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/award?keyword=cambridge+english+placement+test+for+young+learners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369311/normal_6027c57a545ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60663d982510a.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/hidgi4P/83340350364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fdb04b259322.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/ijjckia/90602429843.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/hgheiiN/screen_timeout_settings_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500450/normal_60359516548db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_5fdb0f18c92e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fdbe07ed5742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5fdc409d65bb5.pdfIn PDF document text
    • http://copyrightproblem.com/plague_inc_apk_premium_1._16._3td22c.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/Hihysic/23175616085.pdfIn PDF document text
    • http://kieverts.xyz/lukemebojogerunezibureggrhbo.pdfIn PDF document text
    • http://ranking-se.com/20530403270zio5e.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://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_c178fccb1dbc4a6094f1d0c014bfd5d2.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_1f035c83b8a64d4e8e208da92a4ac78d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c65763-a5eb-4b4c-be1a-f1751da4f2a7/para_que_sirve_el_zinc_elemental_50_mg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac5c992-d078-4815-a29f-14599c95d837/litany_of_humility_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5d6e97-c2a3-4cd3-a93a-20a4d506ccde/98430971311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a36655-4787-4f0f-acc2-19a76a276c87/kimunukoj.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_1e18fbf36f6548feb848a7f3e2bc6c08.pdf?index=trueIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_3d2c50c31d4849d0b828af20d9e4b3e8.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_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 5716 bytes
SHA-256: 1591abaf6a98c6d85df3154234e424e67b485d79ddac8e41006d9863d651be19
font_01_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 10672 bytes
SHA-256: ecd6626542b93cab17b4d9a4d3ded256bc45e1a375d39f3de2aa4351eb4acac6
font_02_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c