Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b4bf4b0a699bf2…

MALICIOUS

PDF

72.6 KB Created: 2021-02-03 00:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2511629a28dad61e5fff0ab4cbe66eac SHA-1: 2fa83ae59177fbe4822c587bf0bbdf1e48e2a86e SHA-256: d6b4bf4b0a699bf2b82a4e7c9edb76d73551fd81150ac41c05e10a26c2ad0260
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm hosted on disposable domains, with one primary external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=sample+introduction+for+physics+lab+report PDF link annotation
    • http://voduvalegef.66ghz.com/information_about_mpsc_upsc_exam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473035/normal_5feb0fe9a67d2.pdfIn PDF document text
    • http://sibivelemeruzu.iblogger.org/basic_anatomical_terminology.pdfIn PDF document text
    • http://depofukug.iblogger.org/give_thanks_violin_sheet_music.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/simitetupikononepoj.pdfIn PDF document text
    • http://tasefuvakol.22web.org/wofilozuzetinupatefuvisos.pdfIn PDF document text
    • http://vitolebizojigok.22web.org/81311225175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/muduxofisomawojiribapefi.pdfIn PDF document text
    • http://ketanuviz.epizy.com/para_manualidades_con_cascarones_de_huevo.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/15350780161.pdfIn PDF document text
    • http://josuguremim.epizy.com/video_akb48_ponytail_to_shushu.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/kefatoka.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/sinnimo_de_inconformismo.pdfIn PDF document text
    • http://maxuzenikofi.epizy.com/86393432184.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/gotinisegozujes.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 5740 bytes
SHA-256: 875871d177663b233bd2bc5db4eb799ff55e3c6dc6752d46dcdc2f0cd0856f27
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 11452 bytes
SHA-256: 1373f0054b1cb90aa7adc94c47e74a0a35efcc4fcfef4ad61f52812f60397df7

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