Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1e463195287709…

MALICIOUS

PDF

89.5 KB Created: 2021-02-13 08:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: acb71466cc820e591c6664433de3e20e SHA-1: 54715a35c74aaf3800887ab018134a05042aeb53 SHA-256: dc1e463195287709ad513fd5bd9342d3eb92390ec197fd57a8ea0bd699ce6d98
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Roblox assassin aimbot hack 2020', indicating a lure to attract users interested in game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=roblox+assassin+aimbot+hack+2020 PDF link annotation
    • http://mjawebdesign.net/81544648410ue18s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417045/normal_5ff53e116fd0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5fc61e71cedc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_5fd798e142ded.pdfIn PDF document text
    • http://ca-manalapan.space/general_engineering_questions_and_answerspw9wu.pdfIn PDF document text
    • http://psychologyrelax.xyz/workday_hcm_training_materialuf7gw.pdfIn PDF document text
    • http://ita-talia.fun/lisefilogijavibufonavegp3x9.pdfIn PDF document text
    • http://afracheat2.xyz/dowodotagidobebexal7goa.pdfIn PDF document text
    • http://4338bacchus.com/dutibokonilirovenitema3fotd.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/gegeicp/lara_croft_relic_run_free_download_for_pc.pdfIn PDF document text
    • http://trychambre.xyz/kixadevero7hwkk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fc944edbcc4c.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/aJuchaw/piano_keyboard_layout_61_keys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://worubag.epizy.com/vozurusaguwemiwapel.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013d43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D43 17580 bytes
SHA-256: b56701d766a6b5bd6aa5a7ddaf62889e54b57d60f57507ffd29441e3f4d2184d
font_00_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 5496 bytes
SHA-256: bcb7d0d8ec05d5a3d1dffba7f45668b1a31f6a77478d3b64e5d745abcf5630df
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 3352 bytes
SHA-256: af1f12b7f67afb0f4db8d7aedc57bf227e7b01c6ecdd27d8f1090ea43ace6602
font_03_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 12220 bytes
SHA-256: b73207688b320f1301c39a4594d6787a860aa1f23574bfee9734c71a42578025

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