Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a46f8def42e676…

MALICIOUS

PDF

75.5 KB Created: 2020-11-09 23:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ecbcfb7c9f9bbddb1b417112f8495f51 SHA-1: d0dc9e85c09a985c57cfaf1ae61f1b81ac32e397 SHA-256: 99a46f8def42e6760c910fd36d539588ea76047e6bd6499843f58b366ff4ec72
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 0.9998

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
  • 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?keyword=dictionary+of+psychology+terms PDF link annotation
    • https://gimifuzakid.weebly.com/uploads/1/3/4/3/134315082/fisudafasoliwe-jives-lagepezud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f8e0d4f5203a.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/zezavuwonenuno-vipabagatopo.pdfIn PDF document text
    • https://rumidevuj.weebly.com/uploads/1/3/4/3/134310249/7637924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f92319edce9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f9d3d1a78614.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/569a2873cc8163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_5fa9a6a26ee3d.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/wegemebufojafak/curse_xx_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/rezagefujixarawisaxixas.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/please_find_attached_sign_document.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41997543-9699-43ab-85b5-46bea9432363/larry_crane_the_abundance_book.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/23818750076.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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 5528 bytes
SHA-256: 1b7516e55720eba7cc70db9a11d769d71afcecde2248c2bd4c91411673e3e05a
font_01_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 9956 bytes
SHA-256: c4d33d22f201faa82ba2c7df0336a175ea79843cfb840667274bb72acb9c063c

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