Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a80b83fea3160b…

MALICIOUS

PDF

82.4 KB Created: 2020-12-29 22:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b39bc416ca3543fbf13fca2a4a7590e3 SHA-1: 9f1c89c10f830f214e8841b87d40d518e901b1c8 SHA-256: c3a80b83fea3160b865859ac1d90c20ef34c34a136f682575f57edfaac5ab40f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing to a URL associated with potentially malicious activity. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=black+clover+phantom+knights+mod+apk+english In PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/dee897f3cdaec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5fa93f172eab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f8e96272a4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd3486652815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366033/normal_5fc900e5c3bd1.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/vawulimigun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_5fa43d1880c9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/cset_social_science_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d6ee70-94f9-405b-bf36-206f0c4200a9/descargar_mountain_lion_10.8_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e10adb-b1fb-4daa-bef0-6e8f63ec02b9/servsafe_in_spanish_online_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/black_tie_optional_vs_semi_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/tadusizekas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566ac393-2dbc-4ffc-8d14-c0f3c7ca5ffe/masirusagiroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275253f0-3549-43c1-930c-39027a1b34e6/farmers_lab_seeds_reddit.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 5660 bytes
SHA-256: c6b4bd022f207cf05e8742830d58ca949ce8d6e01a6fc8abd44da2cbbce0c754
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11224 bytes
SHA-256: 5233292207ba5e0e610c524007b5ce439ac384a43093858b6351f91f5fb8cbc7
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 16272 bytes
SHA-256: 4c975c5751d073bbd60a759b5637c12b3f0d2165ec89dd4f9c4a1c39a7d182e3

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