Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19e2ec90cdc16a9…

MALICIOUS

PDF

77.8 KB Created: 2021-03-21 11:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aad1fcc9424f9cf27981a71ad11a1a7a SHA-1: fb49e4cea56870c68ddb18061f02ba60e0668df2 SHA-256: a19e2ec90cdc16a95d92c64e0168fd34f6511a2c908d4f87b5f626521b37251f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to pairing Bluetooth headphones, which may serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+to+pair+photive+sport+bluetooth+headphones PDF link annotation
    • http://help-feedback-amzn3.xyz/pekekopugupoxadanajedp0vr.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/80248835618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_602eaebe60d6b.pdfIn PDF document text
    • http://weraka.online/chinese_olympic_weightlifting_bookqf54n.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/yjatgeA/warzone_download_time.pdfIn PDF document text
    • http://women-ita.space/7473209693b3hul.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/ajbhbje/48679395832.pdfIn PDF document text
    • http://anyita.space/tijujodepevakanie7l5.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/gflbgfr/anti_nail_biting_polish_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450039/normal_5fcc9b188a1d1.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/cjjxjg1/tewusi.pdfIn PDF document text
    • http://mananeje.66ghz.com/fibesakaturemaf.pdfIn PDF document text
    • http://golixudib.mypressonline.com/wikaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_5ffeed37332d5.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/sexual_orientation_definition_apa.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/6329017580124ts3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupubavamuwoxaz.rf.gd/dativopufo.pdfIn PDF document text
    • http://pakemefasimamug.epizy.com/65521869807.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/37820466391.pdfIn PDF document text
    • http://pasudef.rf.gd/mandated_reporter_illinois_law.pdfIn PDF document text
    • http://ragoposetetadu.epizy.com/kx_pilates_prices.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_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 5300 bytes
SHA-256: 153a1a122d5283c170e5779640bd1158fff5057d45be6344934521bec996acc7
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10280 bytes
SHA-256: 5134e4809dc76c17892b79564054b31bcbdcbd7f0d551e011d52763b8fdf982b

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