Malicious PDF — malware analysis report

Static analysis result for SHA-256 2422bf5ca44b4138…

MALICIOUS

PDF

72.8 KB Created: 2021-03-25 00:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16ddfe2134eebf449310aca72081eec4 SHA-1: de0d47e1202526d3beb29dddd32c4eda60dab7be SHA-256: 2422bf5ca44b4138b9b8d334c1bd8adb671f3a30db15efcd22c1efa006d5d255
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains numerous external links, many of which point to SEO redirectors designed to phish users, such as the URL https://soxebez.ru/strik?utm_term=is+infrared+heater+better+than+ceramic. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a phishing or link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=is+infrared+heater+better+than+ceramic PDF link annotation
    • http://totaxusozavu.sportsontheweb.net/macbeth_gcse_notes.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/inherited_disorders_of_lipid_metabolism.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/peter_atkins_fisicoqumica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_6057c160af597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_604a2e5ca3373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_5febb2b584655.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/how_to_prepare_red_potatoes_for_planting.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/toro_string_trimmer_head.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_60374222654ee.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/the_expanse_season_4_episode_10_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/juweroxofi.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_9a03f629d2fb43da95fe1e6cec8d8d50.pdf?index=trueIn PDF document text
    • http://pitaken.onlinewebshop.net/33081610390.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/tamil_songs_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/3500266507.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/riviv.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/femisewokobemukodizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/kedipa.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_5c371a36c6644781afd96df4af7e0b25.pdf?index=trueIn PDF document text
    • http://wivaxodi.onlinewebshop.net/juwudalalimumexadadaporax.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_e82855ce6a7b4e8e8c1779518fbbde07.pdf?index=trueIn 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_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5304 bytes
SHA-256: 60f7add71f388c4acc7fe4928102a8223ea6172246a83dac549a267a1fdb8809
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10296 bytes
SHA-256: a099e024f91fe06e02a1019fa33cd7280ab45bf57cf62c4ab30e7d5866f67551

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