Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3fa572e3816b7b…

MALICIOUS

PDF

66.3 KB Created: 2020-12-20 05:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 55c2d599d1c285803d2a6b3299aed5e2 SHA-1: 110b632e6ce392a3fd40224b061078e856ee4ce5 SHA-256: 1c3fa572e3816b7bba6399bac85332d332b385c80594669be8654f7db64ffa34
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://traffking.ru/strik?utm_term=right+behind+you+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fb6cd6d65da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8fdd4886fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5fbbfd35df8a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5fcf99d4168ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_5fb5080de78ed.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/kusope_fujoz_neretar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f88955861258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5fd9afe24ea49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_5f9d16067e653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f89c908aff60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://static1.squarespace.com/static/5fc105099955c744b53c37bf/t/5fcc85f4d336b863f0bbf561/1607239156599/brick_ball_game_free_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/luwovofufekipapedusuden.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 5240 bytes
SHA-256: c37897c505ebd0acca5669db414bd7460bab9a2dda02a2cc34412a96f82fbcba
font_01_sfnt_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 8036 bytes
SHA-256: c6e2328edcfe22eb601d7a6bcb01cee9f9d770e4e6926b7db85fe0cc16ce7f51
font_02_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 9648 bytes
SHA-256: 5e23f9d96622d6079ca2c42ab02942c430e047143ca50c479a45fa5130ae7bb7

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