Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4635629deb49b8…

MALICIOUS

PDF

73.1 KB Created: 2020-12-24 13:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 02ad5ab6554249561e16b1bb3b625cc2 SHA-1: 7f72b32816d4c8e0db39b9b047bd80f7555b97e8 SHA-256: ed4635629deb49b89f61f81ef04c453d89043d9fd0b96d40392a257d359c4838
274 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and is flagged by ML classifiers and ClamAV as malicious phishing content. It impersonates Microsoft to lure users into clicking links that likely lead to credential harvesting pages. No scripts were extracted, but the presence of numerous embedded URLs pointing to malicious infrastructure strongly indicates a phishing attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kagizorofom.weebly.com/uploads/1/3/4/4/134476017/5147163.pdf.
  • 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://cctraff.ru/aws?utm_term=t-+chart+diagram+template In PDF document text
    • https://cdn.sqhk.co/pupevadojas/gicOih4/space_simulator_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f9c0d7068d24.pdfIn PDF document text
    • https://kagizorofom.weebly.com/uploads/1/3/4/4/134476017/5147163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fd6759ab9c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fbd804137f33.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/remomerifiguzibuk.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/hcicNii/pet_emergency_room_24_hours_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/dihzXif/suppository_for_hemorrhoids_walgreens.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fd643a925e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fb9b4fa640f6.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/15fb9a72-3c86-4efc-9a40-a869bc734aa4/feeling_is_the_secret_neville_goddar.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/33619861356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a3af88-5cbb-469b-ac63-8ed9a3f9e3d8/kulemutijixetilutotoni.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/53960127532.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/xowobisokotamedawit.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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5292 bytes
SHA-256: f29241b92f80f18bc51c57972ecf5c05cf5bca915e06bc971cc9de164db345dd
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10644 bytes
SHA-256: 5f26ef9d046cd8d90f407791b200faed10012c417b9c975ba436a256e7b705cf

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