Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08a1c6d6ef2619c…

MALICIOUS

PDF

82.6 KB Created: 2021-02-25 07:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 139a7bc069e3d7ffc0493a88d3de84c5 SHA-1: 73bdede65496c3c426ec8d6672d3f18978d3ec73 SHA-256: e08a1c6d6ef2619cd3db2c7d1f37a449c0197f8274c49127b29114aec5c3cf4f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' intended to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

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 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.
  • 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://jottigo.ru/award?keyword=learn+english+free+games PDF link annotation
    • http://wimorujul.iblogger.org/how_to_properly_apply_a_bumper_sticker.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/gironisuvugoxodej.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/wijuxujisid.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/a6efba6017e.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/eclipse_for_selenium_automation.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/gewumegav.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/lejivugeleguwod/kellogg_one_year_mba_employment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/volexaxabizebabuwawopevu.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/13051823794.pdfIn PDF document text
    • http://durunorutap.epizy.com/greenburgh_ny_police_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/kafitiruwa.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/5175492733.pdfIn PDF document text
    • http://bejopirobi.epizy.com/ny_times_crossword_puzzle_answers_today.pdfIn PDF document text
    • http://tikarere.epizy.com/acdsee_free_for_mac.pdfIn PDF document text
    • http://renirujetumofid.epizy.com/latest_guidelines_for_c_difficile_treatment.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/does_chloroform_have_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/exponential_decay_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/canadian_citizenship_by_descent_application_form.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_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 5124 bytes
SHA-256: b558d72a741af3f5e03b03fd9949ae25ee294d5b06014e724f3ea2742735e0fe
font_01_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 11276 bytes
SHA-256: eca126d1a7bda6a91a66536dfbb4b2b3eca957755f690eff81a2d2c3d1425da2

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