Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc40eae781fd0365…

MALICIOUS

PDF

71.9 KB Created: 2021-03-21 03:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a1ca1cb141422d6d70ecd395e8be2fb SHA-1: 5b9081c5c9035265476155498e8ab4438a673aaa SHA-256: bc40eae781fd03659c61ed57a68fa426e13d5023539dc67d560777b2f8940b76
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/award?keyword=3d+pdf+exporter+for+revit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd15296bcfdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_600c1c2465221.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/ayushman_bharat_disease_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6033651626645.pdfIn PDF document text
    • http://tusalolorow.22web.org/psychology_applied_to_modern_life_12th_edition_free.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/reduce_file_size_online_free_below_100_kb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_600f30cb9401d.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/lifetime_54_portable_basketball_hoop_assembly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_602a006d9f9db.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/levantine_arabic_dictionary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegunag.rf.gd/kopunolofadime.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_ed96e5c41d4841b28ec1bd2da6d7bcec.pdf?index=trueIn PDF document text
    • http://tofujuwo.onlinewebshop.net/which_country_has_the_largest_economy_in_east_and_central_asia.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/66123310719.pdfIn PDF document text
    • http://zefojebenodimu.rf.gd/my_talking_angela_hack_apkhome._com.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_8972e53a1c8b4bcdbe34783564f9faf9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosawef/weather_report_cedar_park_texas.pdfIn PDF document text
    • http://riwevanopa.epizy.com/cub_cadet_lt1050.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/a_discovery_of_witches_series_2_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/62593399072.pdfIn PDF document text
    • http://wikatamuk.rf.gd/muwepuvelegagado.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 4812 bytes
SHA-256: b5ae56e9df65016b3e15cc7e6f027b048f445cbea0bfbfee56a6e56895ecba66
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 11328 bytes
SHA-256: cb67a5cf959d6a122a1ebd520fdf7cc73cf44c05530194b18244c2c2e08fa398

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