Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d57e5143d6921c6…

MALICIOUS

PDF

67.5 KB Created: 2021-05-21 05:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 09fa4368609ffbdaf70c532a7ed02341 SHA-1: 220d1d97c22539667941426b209e0bb84ee1f4c9 SHA-256: 0d57e5143d6921c63487097077402f0945bbf6ecd518c00cc9aa89725176bfd1
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF hosting sites, indicating a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK firings, along with the ClamAV detection, strongly suggest malicious intent. The embedded URLs likely serve as redirects to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=subject+and+predicate+worksheets+pdf+grade+7 PDF link annotation
    • https://wenexirotupunam.weebly.com/uploads/1/3/4/7/134736105/rawakanopape-jatewusiw.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/fitaroto_jesutumubot_galof_fenekopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_6061490112982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_603e8ad4c9f1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375909/normal_5fced80518f88.pdfIn PDF document text
    • https://jewaxesototipa.weebly.com/uploads/1/3/5/3/135326518/01954358dbc2249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fc828783cec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_6043c02e4d0fe.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/xelunez_bewelidazepuf_xuweban_japaxinetitoru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab064a50-d5ec-4ffe-b7c2-8431f820ab07/44265902064.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/la_times_jumble_answers_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0714506-146f-4a46-b787-fa86aeab311b/wendy_nutrition_best_choices.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/mobile_legends_arson_attack_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/dogirotosubuziguwodomivob.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/10200179547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62eeaa7d-c4d8-4af1-b024-64825a2e3460/citizen_watch_eco_drive_price.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/molecule_polarity_phet_lab_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed46dd0-8124-4265-aa9d-c735f1db5199/28220174906.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/cartoon_network_games_apk.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_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 5940 bytes
SHA-256: e1f1a3ddec2243ba1ef79a0a99a376037355258da71eec965504e57a25f87027
font_01_sfnt_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10500 bytes
SHA-256: cd206c443d8e48bece899525a38060c51f5ac7b4dad7c80226f34349a6538a2c