Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf2be3993ea6f73…

MALICIOUS

PDF

72.8 KB Created: 2021-02-19 10:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3c420f9aa8212697b1816c75478cf242 SHA-1: 1436b06503b160e6a704be0153381b8f36ab0d24 SHA-256: eaf2be3993ea6f7334fd0f192f68994bd9214f0b5284cdd017c5e5225dd8112f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The document body was unreadable, but the presence of many external URIs suggests a phishing or malware distribution attempt.

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://jacksth.ru/strik?utm_term=d%2526d+beginners+guide+pdf PDF link annotation
    • http://citimart.online/filmyhit_hollywood_movies_2019stwyp.pdfIn PDF document text
    • http://classkaod.ru/bed_plan_cad_block_free3xcaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/4FHhatt/tattoo_design_maker_man_woman_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/Zhcdmgj/19607283143.pdfIn PDF document text
    • http://creditscorerepair.info/samsung_un46b6000vfxza_remotej94ig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5ffa1b49a1ab8.pdfIn PDF document text
    • http://dimax.website/594193661304266z.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/BijbDbn/jumalebipasonubikeluniza.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/qnLGgh0/26645497047.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/iOkVjhO/wordscapes_level_8544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pukokudew.epizy.com/what_is_the_difference_between_general_deterrence_and_specific_deterrence.pdfIn PDF document text
    • http://repeputowuz.epizy.com/fur_elise_music_sheet_letters.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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 4156 bytes
SHA-256: 58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10308 bytes
SHA-256: a779da1d86a4c22005a062e67dce06c363e0fae1658159d4e678c35e701fc932

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