Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcc791201109bdb…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 16:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b39dc92d113cab47c3a6eb7be7d7d1c5 SHA-1: afcb5b9e9e59362d713fa2f428c7e0b202a58ec5 SHA-256: bbcc791201109bdba2e7b393c5ec0b014e5fcd06b397a1755ec35c6f23b076eb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, including one that appears to be a lure related to 'meningitis bacteriana en pediatria pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/award?keyword=meningitis+bacteriana+en+pediatria+pdf PDF link annotation
    • http://pupezawat.scienceontheweb.net/gugijulolapo.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/fur_elise_piano_sheet_music.pdfIn PDF document text
    • http://instahelpforbusiness.com/sovedvi9y9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_60497905cc61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_6014e02db4516.pdfIn PDF document text
    • http://chambrehq.xyz/nursery_alphabet_writing_practicern5sm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fd159d7ec17c.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/27971588032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_603bbbc45cf0a.pdfIn PDF document text
    • http://manovina.mypressonline.com/37769584580.pdfIn PDF document text
    • http://hytri.com/941029944863hwe.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/c01da785-ccc1-489a-b67c-cdd7b745af96/the_true_story_of_the_three_little_pigs_sequencing_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/darenetomimexebev.pdfIn PDF document text
    • http://mifaneneveloje.epizy.com/central_and_peripheral_persuasion.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/disomegagi.pdfIn PDF document text
    • http://pekagotikoweguf.epizy.com/the_open_window_summary_in_english.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/cvc_short_i_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18664c6-aa38-439c-99b1-79e008423469/25587680969.pdfIn PDF document text
    • http://tudifilik.rf.gd/traffic_report_i_40_west_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/bapodakumozesevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cf0819-ccdb-478c-8094-2fedaa5bcfd7/95987874258.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/how_to_get_bat_in_gta_5.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/watts_premier_ro_system_parts.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 5436 bytes
SHA-256: c6b24d2a65080789155ee4d0f5d856981a956c4b08306a56505aef7d28d17b7c
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 10228 bytes
SHA-256: c6e65649c2f2b526fb083a5aff6bba7731ebd99421e0011c120de97a12893e2e

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