Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dda021021a21af…

MALICIOUS

PDF

165.7 KB Created: 2021-04-07 18:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 38baa1469f4929b032c09e761cfb465e SHA-1: 3223faedb24cf8057d079f67a78a7d457a957e62 SHA-256: a0dda021021a21af5689a2fcd2fbf49a4dfcf30bd6df95a0880a182b3a8e4ff5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dugedepap.ru/123?utm_term=megatron+transformers+decepticons PDF link annotation
    • http://reduslim-europa.site/4478476015njjgi.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/edmentum_mastery_test_answers_health.pdfIn PDF document text
    • http://kartaidatodemeleri.com/arris_surfboard_sbg6580_keeps_resettingxln18.pdfIn PDF document text
    • http://rastet-malysh.ru/what_is_the_central_ideam48hv.pdfIn PDF document text
    • http://psychologyrelax.xyz/3430002191138tr5.pdfIn PDF document text
    • http://small-italy.space/merriam_webster_medical_dictionary_apknt2oi.pdfIn PDF document text
    • http://216tilford.com/mind_over_matter_lyrics_spillage_villagez0qen.pdfIn PDF document text
    • http://prizinsta365.website/fuwejiwisusffi76.pdfIn PDF document text
    • http://pop-marketplace.ru/mugijodieqfmw.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
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_f83716d70555469b9fd1c50389368a5f.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_461b4d3fb5784426baa74bf0c4c012a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/40942083395.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_c47c4e2dff454c17b603f1a1235e3c87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/how_do_you_sort_an_excel_worksheet.pdfIn PDF document text
    • http://jakowufa.epizy.com/30553450768.pdfIn PDF document text
    • http://jizofaludem.epizy.com/nirozoni.pdfIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_dd9e1db020394ed49189322655a928a5.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_1a5c02ab090447c5a0f87765fa07c626.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_c0b0b412dc6c412897b805fd78a2517f.pdf?index=trueIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_341fc32337bd4bfe817b702e156b6602.pdf?index=trueIn PDF document text
    • http://kojokijekuwug.rf.gd/1216449259.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_off00024229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24229 5236 bytes
SHA-256: c73266b37f100604ef9e274d13f8754499a0092bca9b7810c5b172d988941373
font_01_sfnt_off000253e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253E6 11332 bytes
SHA-256: a6ea6d598c373a174c6aa51747142551b89da4d751afed95b8f99ad184a0de93
font_02_sfnt_off00027a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A64 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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