Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b43b30a4b6ea40f…

MALICIOUS

PDF

83.2 KB Created: 2021-06-14 01:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f67b292741d276caaa48b145a69e6411 SHA-1: 1b098a97bea122131ad02bbf32a1d8f15ef3ebf5 SHA-256: 3b43b30a4b6ea40fabd30f4c8e98e443bab2fafe0e4d9dc1d0351292e68f2611
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's primary purpose is to drive traffic to these external resources, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://chcial.ru/pbw?utm_term=bastet+and+ptah PDF link annotation
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/644a6381.pdfIn PDF document text
    • https://gokuveseloniku.weebly.com/uploads/1/3/5/3/135309313/lumixidob.pdfIn PDF document text
    • https://fosozofafeg.weebly.com/uploads/1/3/1/8/131856121/dusowibaba_fenilabipazewo_mirakus_madubivurisine.pdfIn PDF document text
    • https://lelugiva.weebly.com/uploads/1/3/4/5/134508788/d0120c6.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/1157187.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/nakefas_begewolu_tufumotofida.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/7098469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_60c4d36768de2.pdfIn PDF document text
    • https://zujododa.weebly.com/uploads/1/3/4/6/134652654/bofesudusa.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/ec5df3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461245/normal_60b4eaf590c85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a497af97-b98c-4661-83f7-fe0fc6ffe990/osha_safety_standards_covid.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/how_to_uninstall_wii_u_usb_helper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8142cf-cef6-46eb-8281-33cc360c37fb/how_to_program_automate_am6_remote_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a22a68-f0bd-49a4-bb19-73fbef947cfb/xadufafuxomepodivipu.pdfIn PDF document text
    • http://muzurinugaw.pbworks.com/f/sat_subject_test_math_level_2_past_papers.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/59977348173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a59e28-ec5a-49a5-ae6d-a64ffa48700e/naxusi.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/writing_portfolio_rubric.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/w/file/fetch/144743580/how_to_run_python_program_using_command_prompt.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 4968 bytes
SHA-256: 52acee98efd10632a1cd12a868c16b8d6b6fb80378e796efc1f890ea54728663
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 12464 bytes
SHA-256: 1b2531fcf2474457926701116b38840247b36bca83806f21c55625115bc9e488
font_03_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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