Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8462f65641663f8…

MALICIOUS

PDF

62.4 KB Created: 2020-12-10 21:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 50962de17fca620a6162281730d714c9 SHA-1: 1cdf4cc79d9d3d79753ef333c23b62eeed49c4db SHA-256: f8462f65641663f815cee3322d5b19ece0996722354978dd60ed714da5282f0b
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'area compound shapes worksheet answers', likely intended to trick users into clicking malicious links for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=area+compound+shapes+worksheet+answers In PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/wejozerevivuxuwep.pdfIn PDF document text
    • https://ruwusugotalub.weebly.com/uploads/1/3/4/6/134690364/5533143.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/xikoxipikev.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/3736056.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/zetogibovapupowike.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/03258f9f6c23ee.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/punadax-kazugokov.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/3278888.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/womexewipepodos_tojubodetas_xofisijojosefu_kafaze.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/091a14e9-4497-45fe-a304-59397ab0f03d/78215431914.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4a28139af037644e7e6/t/5fc18a76145a8629dceaf37a/1606519416788/drastic_patched_apk_jzkz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44ea23d-9343-49f6-8a37-21b8fb720fdf/dauntless_repeater_guide.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_off0000b79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 5428 bytes
SHA-256: a7f0e7ed020bb056f4d820b0d00ca3dd88d1a06c8aea62172add73b6bfd59b69
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 10236 bytes
SHA-256: c18de60ae9d139196a48844c02f419e75f7f53f3206309b456f33b9c0eba8c0d

Open this report in the interactive analyzer, or submit your own file for analysis.