Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a1579109169cfd…

MALICIOUS

PDF

72.8 KB Created: 2020-12-28 15:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9d1cbeee5a72909414836dbdc58ca6c2 SHA-1: 10e77c3f894a28e36d360ce95690fb97514a06ca SHA-256: 53a1579109169cfd8dc9926d7e996b0beab70319324ddfd2501ff855d67230c2
156 Risk Score

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://trafftec.ru/strik?utm_term=pizza+delivery+driving+simulator+mod PDF link annotation
    • https://cdn.sqhk.co/simunenij/ijgz3us/nolerunexedopamo.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/xubipos-pokaxoka-vapunuz-kejujemezofeba.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/vifujamelikunib-samasobujur-guroxubizorom-deranew.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/c08691be-7ca1-469a-a98d-fc2297aec2e3/summer_insect_field_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/20548515473.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/gefopivavuri.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/sonnet_generator_about_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c46854-ac8c-4558-a8a1-377a954a26f0/sojevufofotegiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/delixopifomogotolawol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fc73fc-a90b-4052-8327-85c64a627a00/nothing_to_declare_uk_season_3.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 5360 bytes
SHA-256: 32b2af20b5069e9bc02a7d23adff88eb5426572c97e130d08d22b23e5564791e
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 12476 bytes
SHA-256: d0a0dff6f804a071d40e78577080daf0a65da7a98d9fdb2223f7ee1527f6f242