Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc501f3a57654d6d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 03:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 19530464293a20add0ef5790559d03d3 SHA-1: 29a8ad13c6ef2db137065e5d94a2cebcfa49c754 SHA-256: bc501f3a57654d6d62932d2ed7a49b8a5c81ca9860095f7e8fb3d7262731ea7a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to a redirector URL. This suggests an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kuzutuzo.ru/strik?utm_term=what+is+pippi+longstocking+book+about PDF link annotation
    • https://cdn.sqhk.co/jukunobegabe/RjfiYjD/zombie_shooter_game_download_for_pc_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_601b5c75a09a9.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/gdEhcie/ultimate_xterran_off_road_camper_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_60051cdcb3e1b.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/hdjLWgS/39909589261.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/KrjigjR/runes.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hjBijje/pradeep_science_class_9_physics_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459483/normal_5fde1c367cb03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5ff9883a2f3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_601b1ce5f0dc1.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/xovekolamoxe/90433692397.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_251b7a3d07da46399099a3d4eb931b56.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_ac9c108aa91a49a7827e18efe1a12eba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92658a4b-066f-466d-9c23-a6b63a9eca2b/sitawosozote.pdfIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_568c22dbe32b463597dbc7e7318c8aaf.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_7c591e9ba3a947e89fdb1e34f7ad727b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/49234852132.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/zipatezarirupubotomedosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af01baa1-932f-49db-9b5b-14deb715fe6b/how_to_reconnect_kasa_smart_plug.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_4477426c82f74c76bf008777d289f788.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/png_stickers_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/careless_whisper_alto_saxophone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/gategavuri.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/do_all_ipods_have_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/5905369123.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/twitch_prime_pack_3.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 5316 bytes
SHA-256: 34a718604cb52b357b316614e956e8aa97bf3d324748be451878fefe82bc3fb2
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 11892 bytes
SHA-256: 0ad5a2198b3e42c3fb067467de4307c27d13140ad779f47e3f17595b3b654b7a

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