Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1c46d505fa4aad…

MALICIOUS

PDF

77.9 KB Created: 2021-04-22 07:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8e92812950daaf636206b3f2ec56273b SHA-1: ded72322b72d30452066cc151bbaa4fbd5b5571d SHA-256: 4f1c46d505fa4aad2d608f401687ed4729e9250c7f2eccb61dc902db394ee4c7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-severity rule for an SEO redirector link. The embedded URL, https://baarspo.ru/strik?utm_term=will+grayson+will+grayson+pdf+online, is identified as the primary indicator of compromise. The ML classifier and ClamAV detection strongly support the malicious classification, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=will+grayson+will+grayson+pdf+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413865/normal_600c7e1fa41ec.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/adding_decimals_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6051fa0d861ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_606b240b6ab7a.pdfIn PDF document text
    • http://volelovapudexif.scienceontheweb.net/50362343136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5fec22bce57d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_6037e7e540314.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/bush_s_chicken_nutrition.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/tokit/27897013427.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/how_to_factory_reset_alcatel_tracfone.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/137741156.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/2727653048.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/bittorrent_free_for_pc_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/cartoon_picture_video_calling.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/what_is_a_christian_science_practitioner.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/lou_gehrig_luckiest_man_speech_text.pdfIn PDF document text
    • http://vezapuro.rf.gd/27328579885.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/zirufobonoluxepesefupab.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/android_to_iphone_xr_transfer.pdfIn PDF document text
    • http://letelexedat.epizy.com/allahabad_state_university_time_table_2020.pdfIn PDF document text
    • http://xugivazule.rf.gd/46568366206.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/97475082059.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/kosomumatatoje.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/32412424017.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/fugenesesasumovi.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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5416 bytes
SHA-256: 007ba581bc14f32243eadf8065e07e43e81e8a3fd3f386f731b48d222f3494f1
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 12832 bytes
SHA-256: cbec5cf2ed7837d7f5b88912f37b140f821ebaa3b819d6bd7c6f3f65341c38ff

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