Malicious PDF — malware analysis report

Static analysis result for SHA-256 d658b600b9c04487…

MALICIOUS

PDF

78.3 KB Created: 2021-05-09 22:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a69b79cfddbb22034f0c0ac55e549de5 SHA-1: 9ee2dbb9dccd86eeb12fed0635986122e5052fb5 SHA-256: d658b600b9c0448706ac09aeb43b6c219637293771b7527ae5e305b4a8d0aa96
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by multiple heuristics as a redirector for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+can+you+describe+the+color+red+to+a+blind+person In PDF document text
    • https://cdn.sqhk.co/menidume/gciOlQG/ashoka_tamil_movie_songs_free.pdfIn PDF document text
    • http://buytoday.cc/75246898392mzxx2.pdfIn PDF document text
    • https://cdn.sqhk.co/vofosutuwo/bjahfig/27639010358.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/0hijghg/ac_ampere_meter_connection.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/hijjDhh/14774409461.pdfIn PDF document text
    • http://fastpeysistem.online/48201172900rr6ds.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/dighcgi/sutodotupiwilapotijo.pdfIn PDF document text
    • http://fullhp.info/drinkwell_pet_fountain_pumps1xk8f.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/fewifuwu/tubowakiropidodeni.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/34524453718.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/form_g-_325a_biographic_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88032899-b168-451c-8568-10ce260dba4f/which_is_the_best_samsung_ecobubble_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/online_challan_form_280.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/gps_garmin_nuvi_2689lmt_prix.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/ravuv.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/what_is_strip_cropping_define_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/brief_formatvorlage_word_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/badowomufakis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5c40d0-ff8a-4761-9ddf-ef66edcdd2e6/33404127114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5c0b33-821e-4855-843d-aa7711501ecb/free_dollhouse_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/xadapofimagidak.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/14318349221.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/ribuloletubikago.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5456 bytes
SHA-256: 2f6eb6f1c4b84b84e2cec22a8f136d1b8bab07265541d0ed16bf935a25b03692
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 11968 bytes
SHA-256: 6ca12f3f0e1e5c0634487729a1a9c5fddb86661c24817888940b90584bab6911