Malicious PDF — malware analysis report

Static analysis result for SHA-256 59008b397643f61e…

MALICIOUS

PDF

72.7 KB Created: 2020-11-09 22:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f3aecdd51b7debe0c07ee64fc8d389f1 SHA-1: 35189aef0f8b88f5a6a5c588d6c0020dab420680 SHA-256: 59008b397643f61eace1f90f7040ec0c9ecabb0c7430c4d1f03285d76387eba8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link and a PDF link farm. The ML classifier and ClamAV also flagged this file as malicious. The presence of these links suggests an attempt to lure the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?keyword=naruto+minecraft+server In PDF document text
    • https://pumizisumene.weebly.com/uploads/1/3/4/0/134017803/segugisejotoxix.pdfIn PDF document text
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/sinadozusoxapeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f89b18fe3694.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/gisopeke.pdfIn PDF document text
    • https://wogilaxafa.weebly.com/uploads/1/3/4/4/134479860/9323482.pdfIn PDF document text
    • https://purowuma.weebly.com/uploads/1/3/4/4/134472698/nopuwe-gebum-kizalaxojopov.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/8267172.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/fuwawibu/livoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9209e77-825b-450f-b4d2-e76c36ddc39f/lozolimopipuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/gisufemuxoxekexafudume.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/45010702305.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/nilularag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e366b2-62b1-49d1-8db1-facd14f205bd/heavy_duty_treadmill_for_sale_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/bivinut.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_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 5024 bytes
SHA-256: 0975e6876750505d0c94a8ba03c7fb934a4986eef5c634df804cc804af74bca5
font_01_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10560 bytes
SHA-256: abff52a00f95af14404af23903551695cd92fe33a47852d83301602938f03bc2
font_02_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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