Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d789413bc66b9aa…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 16:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c655d6ab4f0b508cd469bccf8ce50f78 SHA-1: bb3a6504b9248552205769bf474d00afe034a4e7 SHA-256: 8d789413bc66b9aa379b4dbe669315dbf64bb476ce4b9b4b6673980c794d6823
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-confidence heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One such link, 'http://privateguardingserviceagainstdanger.site/calendar_2019_malaysia_excelacb2f.pdf', is flagged as a random URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vilenefex.ru/123?utm_term=facebook+online+video+er+private
    • http://autobaff.xyz/cuisinart_ice-30bc_manualuxnu3.pdf
    • http://sapazukuwujoji.22web.org/life_inspirational_quotes_in_hindi_pinterest.pdf
    • https://revevapeseguv.weebly.com/uploads/1/3/5/3/135387876/vojibixogenefefutog.pdf
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/tumevepidodu_vuxofofasut_bejekumipu_rozisunuxu.pdf
    • http://figedizizexi.22web.org/empire_total_war_prussia_very_hard_guide.pdf
    • http://lightly.store/lds_nursery_manual_lesson_105qg0g.pdf
    • http://privateguardingserviceagainstdanger.site/calendar_2019_malaysia_excelacb2f.pdf
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/e8da96d4d41e2.pdf
    • http://gooddevice-online.com/transformers_bumblebee_trailer_breakdownetswc.pdf
    • http://salestore.pro/wolfgang_puck_mixer_manualu9yuq.pdf
    • http://bitcoinlearningcentre.online/liquor_price_in_delhi_2020lhlmg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1a44ee7-b2f8-4890-b341-a6eb26f3ac0e/6482768703.pdf
    • https://uploads.strikinglycdn.com/files/3da40dc7-277c-4096-8f61-70ceebd36018/the_game_1997_full_cast.pdf
    • https://uploads.strikinglycdn.com/files/ede856a3-7e24-4d5f-a2d8-aecdb0d4884c/34707382712.pdf
    • https://uploads.strikinglycdn.com/files/3a769c66-77ce-4efb-b791-3a084916df60/bukukiwurug.pdf
    • https://uploads.strikinglycdn.com/files/df05a05d-8bc7-4546-a365-7d2859090ee2/the_ugly_american.pdf
    • http://sefamuw.rf.gd/xuxire.pdf
    • https://uploads.strikinglycdn.com/files/41c55a68-c912-41d1-94f7-0871f4784308/para_monitorear_redes_lan.pdf
    • https://uploads.strikinglycdn.com/files/047bb10a-9d9a-416b-ab95-557d834dafa0/lords_of_chaos_book.pdf
    • https://uploads.strikinglycdn.com/files/47a5eae7-89d1-4b71-bb8b-bfc9bdd8c2f5/mekiwax.pdf
    • https://uploads.strikinglycdn.com/files/272e0ceb-f368-4ee8-ab25-46298188dbff/91083144085.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4f.bin
dc2248b0cc4f38cb0f6065f22de907b618e1b503432d60977ce7cb9a7a8cf5c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 5108 bytes
font_01_sfnt_off0000fec2.bin
ffa53b3ba2b8c3c75137855f2f29b19dd2b35b01b04d546358b2789ce8dd5e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10792 bytes

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