Malicious PDF — malware analysis report

Static analysis result for SHA-256 a769a9e44ab28286…

MALICIOUS

PDF

85.5 KB Created: 2021-03-29 12:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dc488fa2ccb7444c0139f573207128a9 SHA-1: 5bfcb663a255f4619ea6da8ef7995dd775ab2c17 SHA-256: a769a9e44ab2828629c83bc4d69cbaea7e0714d776a65b210cf19e8ddc4feba7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=biddeford+mattress+pad+manual PDF link annotation
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/bojepetuvixam_latazam_mikas.pdfIn PDF document text
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/ginotilofominexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_6045f31c3c809.pdfIn PDF document text
    • https://wemosixalaku.weebly.com/uploads/1/3/4/3/134315089/rarexuzene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_605e111783450.pdfIn PDF document text
    • https://tedevonefuses.weebly.com/uploads/1/3/4/5/134528644/fedasixoziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477183/normal_605a1b424f86a.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/79b71333c.pdfIn PDF document text
    • https://xudorelaguf.weebly.com/uploads/1/3/0/8/130813521/zefiloxatesodi-morevivezibob-susamazunotekeb.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/mapasinogelorow_fixef_sosiwokog_fuxasij.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/5846980.pdfIn PDF document text
    • https://xovokemopozok.weebly.com/uploads/1/3/4/5/134579322/gatiwurugopezegafa.pdfIn PDF document text
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/4482021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fe76d8440aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_605eeafa63ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_60197343ec626.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://uploads.strikinglycdn.com/files/b90ecad8-f499-49da-ba31-e38bf8215149/marantz_cassette_tape_recorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35772df2-2e0e-4e7c-bafa-7ae919c77130/bumajogokuludosenezad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf24cbdd-3cef-4a2f-b261-13b4cd29413c/spiritual_authority_in_the_bible.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_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 5116 bytes
SHA-256: 337c26a1d923d4eab74369d251c99006e97cbe108843d944013923b593d5f6e0
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 11600 bytes
SHA-256: 7649de334ec1e6af2c1992fc2eaed29e73a11992edee87eb11328c4453798385
font_02_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c