Malicious PDF — malware analysis report

Static analysis result for SHA-256 755b2a0686463314…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 01:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a04260bfd36357f1fa38eb09078f05bf SHA-1: c06f7c882227e89033b9a65137b55027f691a013 SHA-256: 755b2a0686463314cdce6d101bff637d67b0897021ec6cc67c58841eaec9180a
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a redirector URL associated with 'free-download phishing' and the document body content referencing 'corrugated plastic roofing sheets' suggest a lure to entice users to click on malicious links. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/123?utm_term=3m+corrugated+plastic+roofing+sheets+black PDF link annotation
    • http://lnstagramverifiedsbadgeforms.com/739816876932zaib.pdfIn PDF document text
    • http://fastgetme.online/kakatlftbq.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/Vhd6gi2/escape_the_prison_unblocked_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/nenafodud/nnihrWm/90479280954.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hdhcpje/nugevutukusasid.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/jeTwhjd/kupumifubipejime.pdfIn PDF document text
    • http://seedcraft.online/1116291295717v.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/ieLBiaa/rofimixuxabije.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/banula/brother_hl-l2380dw_wifi_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/assamese_dj_song_mp4.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/46399400286.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/acrokeratosis_verruciformis_pathology_outlines.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/diprosone_solucao_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/fixesegelubisinovowizip.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/salipidepuniz.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/what_is_the_breakeven_quantity_of_weekly_production_for_this_particular_situation.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/38640101541.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/proroga_bonus_formazione_4._0.pdfIn PDF document text
    • http://xetobagog.rf.gd/android_studio_arch_x86.pdfIn PDF document text
    • http://kujewawazereki.rf.gd/where_is_james_allen_located.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_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 5840 bytes
SHA-256: 94184c63a859f88d2a46fbbd64a8ec847fad6137cd2cff89d91c132a8cbf53cc
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 11240 bytes
SHA-256: 6d33f1a51ab1ef3731666dd6c4cf8f9df0edc7c3a2f83ba85d75dc38c162829c

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