Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3efc00d7df13ec6…

MALICIOUS

PDF

74.5 KB Created: 2021-02-27 02:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cfc54d364a180f9ab04f188d6d2b9b15 SHA-1: 4ee6be307893db1c891322fbee50dce2d70d3518 SHA-256: b3efc00d7df13ec6cd908c23f22ced19451e496f437a00dc6b84b128bc68f1d2
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'sample lab report chemistry pdf', indicating a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=sample+lab+report+chemistry+pdf PDF link annotation
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/6521827.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Ucxijij/descargar_videos_de_like_idm_no_me_deja.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/9iigqjd/78411473837.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/fejobud.pdfIn PDF document text
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/dakomonejiwev.pdfIn PDF document text
    • https://cdn.sqhk.co/wevavagu/dhihdhh/starfall_numbers_123.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/put_sheets_in_alphabetical_order_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_603417ef554e6.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/goodwill_near_me.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/vuweramazusa.pdfIn PDF document text
    • http://ziwixan.iblogger.org/lotuwofepapobulawomaxulo.pdfIn PDF document text
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/822df0831.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/rufadixamipo.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/ghji0ib/air_attack_pilot_jobs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwivazud.onlinewebshop.net/sutikikafenelogugexulekid.pdfIn PDF document text
    • http://segegilomojok.epizy.com/dasufafixiso.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/56847620631.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 5740 bytes
SHA-256: d7cb75fad38140fa1586f0d4738aebf4d9a1ecf19055c0f68c3b3cd1c582800e
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10356 bytes
SHA-256: 35d3185e3ea9dc621620847f54a79cdff3b7092220d672f8043523447003db8e

Open this report in the interactive analyzer, or submit your own file for analysis.