Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791e4975a3ddf3a…

MALICIOUS

PDF

89.4 KB Created: 2021-03-01 13:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 75e5453c769c2fde95f6bd4501169d3a SHA-1: 8ba2b2529682c39f14236703984a7361b411ce45 SHA-256: b791e4975a3ddf3a5b467c44c2126f996ae565fd436d25f0f7a8cfc9032e7999
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, appears to be a lure related to Minecraft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/aws?utm_term=how+to+change+painting+textures+in+minecraft+1.14 PDF link annotation
    • https://bomigisojibovo.weebly.com/uploads/1/3/0/9/130969974/kiwujijewimetoj.pdfIn PDF document text
    • http://lijamerogavex.iblogger.org/76927448635.pdfIn PDF document text
    • http://muvibigi.22web.org/how_to_fix_a_samsung_refrigerator_door_handle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_5fda4584d2f12.pdfIn PDF document text
    • https://tarokomilidifuz.weebly.com/uploads/1/3/1/6/131636676/kamojonavumono.pdfIn PDF document text
    • http://jufidozotazi.66ghz.com/11865370150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5fe11be833623.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://sizuzupapefapo.epizy.com/phrasal_verbs_pre-intermediate_exercises.pdfIn PDF document text
    • http://pasigajixivete.epizy.com/kiroxawumuzijisikavi.pdfIn PDF document text
    • http://dozonexupiwef.epizy.com/28509820147.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tamas.pdfIn PDF document text
    • http://boligasenupe.rf.gd/terekubosifowipop.pdfIn PDF document text
    • http://muxovunibo.epizy.com/expression_of_interest_tender_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 5572 bytes
SHA-256: b705848e2ce561013617f0b798b61fcde7e6f7ae0a87660449202e995a5344c6
font_01_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 11208 bytes
SHA-256: 4015520cd7b674aa1a49bed532caa4f1a2c792465d8de566840edf2f06121b57
font_02_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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