Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3731b54ef9d688…

MALICIOUS

PDF

80.9 KB Created: 2021-03-07 18:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 49c909dbff719ad158eb62e6d9de7d58 SHA-1: 1bb315eb67a08b062f15ea21e1ead0201d0e2e32 SHA-256: 5b3731b54ef9d68837b6250143e00a4bd4c008852f4e172b4cca8a36ab765d0b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to 'https://kuzutuzo.ru/award?keyword=ingenuity+baby+swing+problems', suggesting a phishing or spam campaign aimed at users searching for information on baby swings. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://kuzutuzo.ru/award?keyword=ingenuity+baby+swing+problems PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ffb0a6ee6580.pdfIn PDF document text
    • http://viwoxavufonodu.22web.org/86372056378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_5fd906f2bce5d.pdfIn PDF document text
    • http://jobauthor.online/quantitative_aptitude0pel2.pdfIn PDF document text
    • http://vulefuxudonad.22web.org/97348526512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5ff275f898486.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/detaposi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_5ffa6abe440f0.pdfIn PDF document text
    • http://fitokapss.xyz/rekajovedikisry91.pdfIn PDF document text
    • http://prizinsta365.website/curriculum_vitae_format_south_africaqavae.pdfIn PDF document text
    • http://alluniversity.fun/ayogya_kannada_full_movie_hd2puur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_600940d4de5be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fdb715ea2e3e.pdfIn PDF document text
    • http://itwow.info/metallurgical_thermodynamics_ahindra_ghoshhgkgg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xivivafin.rf.gd/43537398758.pdfIn PDF document text
    • http://nikalokibutoxes.rf.gd/allen_bradley_compactlogix_l33er_manual.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_315b8b364f174fd981dc1bd554f7f553.pdf?index=trueIn PDF document text
    • http://xasoxutek.epizy.com/hershey_bar_wrapper_template_for_graduation.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_f46eacc88ab645f4975564efc69f5120.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_92de0ed034544b74a568526016ea2642.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_ce9c8a530f294c75996328b736c7c42d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5292 bytes
SHA-256: 990b8d8869f5ee2d9178ede92a3c8cb23d3d9073152de2ce2d795cb5253d39d3
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 11056 bytes
SHA-256: 3b361e0c97eb1aebe3d707538b9ed5b59a3c52297c42140e77299719841dc112
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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