Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fd3765e65d8a67…

MALICIOUS

PDF

87.0 KB Created: 2020-12-04 12:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 255cad6301aaab4067cb67e5633969e5 SHA-1: 76fb836784967be5767c888c6b556b99625e0b56 SHA-256: 59fd3765e65d8a67ebd2fb38513fa27e1c5fbeed710f7699ceb9a91f7bda9e90
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://trafffi.ru/aws?utm_term=vtech+phone+manual+cs6719-+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5f93da63d1839.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/vaxiganu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fa5ee6551213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fc0b3a53a96c.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/60150dfa-243b-4a71-a99f-f60f75beb4f8/vebogonusurigobedodize.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc70099aa0dc1643a2edccc/t/5fc925a16fd9b263d7640ac1/1607017891493/hd_wallpaper_1920x1080_dark_forest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5101a3-8e91-4d44-8f15-445c2e9383a5/car_games_unblocked_drag_racer_v3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28309bdc-24e1-49ec-8300-6782ceab456a/85134881028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822ba2da-4a6e-4c22-9f36-6935f6060738/88503780268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92124ecc-e01c-4cf0-aa65-3a21fe1eecb8/state_of_no_loss_acord_form_fillable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/968f9a88-7f11-4647-ae17-bcaeff1f1eda/2020_eid_ul_adha_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39609d7f-c80a-4491-a40a-3489ebb72dba/82523638452.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf96864be903ae64002cf/1606220136844/brown_v_mississippi_brief.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_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 5648 bytes
SHA-256: de98a502b19cf058a7c273609b336cfa9602dd3defc2e07b417efb79fd1116c9
font_01_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 11868 bytes
SHA-256: 65d2dce784245ed2ce51b1ec337d77b756adb49892160e35f638b33c4ebc89b4

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