Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a752427edb28b…

MALICIOUS

PDF

73.8 KB Created: 2021-06-05 18:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d0b2dce02312d15f2ad417125221e9ea SHA-1: 408a26aadd67cac0b298099b228664d888321b3d SHA-256: f27a752427edb28b08722023f8589e2a581b79580df77cd9aa008d74b662c477
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting a lure for a 'Toyota Camry repair manual' to encourage downloads of other PDF files from various hosting services. The primary malicious URL identified is https://medvor.ru/pbw, which redirects to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/pbw?utm_term=toyota+camry+2002+repair+manual+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378164/normal_604834726e260.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/jukakowofusol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_6034a094e6b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_6060cb28501f3.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/ratugagerosamud-jokokup.pdfIn PDF document text
    • https://radenomubadinor.weebly.com/uploads/1/3/4/1/134108668/8f5f6e870.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://noxiwako.pbworks.com/f/81199851256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b00fc0-c8d5-44b8-8899-694bc48d6052/dopobefasujuredasefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4a81ac-a5b4-43c9-8763-b997bc6bad09/abrsm_music_theory_past_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ef0854-61e5-481a-b7ff-7afe348deeab/introductory_econometrics_wooldridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173c2009-1f6d-4706-abc7-9ca42f8428ff/gutisadaxisevidoxe.pdfIn PDF document text
    • http://nipekari.pbworks.com/f/god_talks_with_arjuna_the_bhagavad_gita_-_hindi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccb437f-7c83-4450-8dc7-df388f699e18/biblical_meaning_of_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e51ab23-ce3c-4cc0-8245-c00d94168ba4/zakoxabu.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144444672/fifty_shades_darker_full_movie_download_in_hindi_worldfree4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a886817-0d2e-4e20-be64-08259428bf90/gesosimelalagima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd1752a-68f9-4aef-9760-07e44eab9518/86955103720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd0e960-e7f1-43b6-b88e-0a7fd88f7b5f/2241681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacdd101-30a0-4275-8e51-a9a850df87f2/latest_news_between_india_and_china_in_hindi.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/how_to_apply_arrear_exam_in_madras_university.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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 5420 bytes
SHA-256: 0f247375de6ae48e136d5d33c8a552911c3a6276cf0791394196300b5ced495a
font_01_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 9968 bytes
SHA-256: 81e95aadbdd9f24cb8609b582d488256554c46cb4dc64d0d3a8a01c898ceab92
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2