Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6548e1cb4c3d3b5…

MALICIOUS

PDF

73.2 KB Created: 2020-12-28 20:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dcfeaa6fb680b7e169fa2a61697e3504 SHA-1: 814de74ee34629ccf2e49a0666af801604669f71 SHA-256: e6548e1cb4c3d3b51f1854ed8e663602f73f6dc15b2836a9e81df416908a8ce3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' suggests the document's primary purpose is to host a mass of external links, likely for SEO manipulation or to direct users to malicious sites. No scripts were extracted, but the presence of numerous links points to a phishing or malicious redirection attack pattern.

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
  • 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.
  • 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://gettraff.ru/123?utm_term=the+little+match+girl+analysis+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4482882/normal_5fdcf2d6e8ea9.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/Chj5Uhe/fleet_combat_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_5fb56e67162d2.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/5341155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fb553bf61b6a.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/ihjdeSk/kagimaxovuxovekedo.pdfIn PDF document text
    • https://bazawafamojuw.weebly.com/uploads/1/3/4/5/134508147/viveki.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/ghhgias/21441932481.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/gfgchjh/37132273574.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/W4FDihV/88108882338.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/Uk3xijS/college_football_national_championship_2020_live.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/de785c75-6388-4b71-910c-059559aa079a/29683203416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d589747-3326-4689-a029-134d81fe43ff/92533521259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413362f5-22b4-48dc-b8d8-794e114b4422/kemulul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e8fdf7-54a3-425c-b633-22645079219b/connectify_hotspot_crack_2019.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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 5620 bytes
SHA-256: f927fb851a4b53b6f2ddc4b2e2c70cfcc3a02e0f379592371af303052c58ec17
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 10564 bytes
SHA-256: b1986446a259e0244d9c1e1dcbf300511c67b7b2e7016e0c7c3ceea6eaa170fa

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