Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce35b27c2f12c181…

MALICIOUS

PDF

69.7 KB Created: 2021-01-09 21:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 59419a45de8759bec2124d9213e69abb SHA-1: 96f71e237504973e563906bad598d454bc7ed6b6 SHA-256: ce35b27c2f12c181d072d7a8dc6ebf884c5297fd165bd54f1467ee9e2d8bafca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to wedding venues, which is likely a pretext to drive users to malicious sites. No scripts were extracted, but the extensive use of external links and the high ML score indicate a strong likelihood of malicious intent.

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
  • 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.
  • 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://trafffi.ru/123?utm_term=heritage+hill+historical+park+wedding PDF link annotation
    • https://site-1179601.mozfiles.com/files/1179601/virifupexikozifib.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/asteroids_arcade1up_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_5fe8adbe24b44.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/Bijhiif/dumb_ways_to_die_pc_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UzMo8f8/color_by_number_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/8jd9giW/wetowamepere.pdfIn PDF document text
    • https://site-1179105.mozfiles.com/files/1179105/popuniw.pdfIn PDF document text
    • https://site-1177982.mozfiles.com/files/1177982/rarozedopodizuniw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff189ffbb6c2.pdfIn PDF document text
    • https://cdn.sqhk.co/xurunesijud/ahrgiie/exploration_and_colonization_study_guide_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fcb68ef20f34.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/pirosisob/xifaxegitadar.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_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 5452 bytes
SHA-256: 6ef04ad38ddf448969261bbceb497cd9b7619f7c8db5d91bdaf58b572131f7c2
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 11012 bytes
SHA-256: d8cc727feeceeb7bf12a2b4d2a3bbb2a6de2751ed8543db5eac0ab397a830b0d

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