Malicious PDF — malware analysis report

Static analysis result for SHA-256 d850aa8406d3a3f6…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 23:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3dfa0fe6fd3d2a7936e749d8723dd004 SHA-1: 831155cbfb7ccd64b9a68819eb6b530084a35e52 SHA-256: d850aa8406d3a3f640e634012f51be4ff98f5a84fc42da5b645c48c02a212ac6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/strik?utm_term=reviews+for+all+my+sons+moving+company PDF link annotation
    • http://keniworu.mywebcommunity.org/idioptico_definicion_medica.pdfIn PDF document text
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/kajaxid.pdfIn PDF document text
    • http://good-production20.site/benetton_f1_logosd3jj.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/SieIqje/first_birthday_party_cake_ideas.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/3293765.pdfIn PDF document text
    • http://startbastar.online/free_bow_tie_sewing_patternt0k5a.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/jixodifesi.pdfIn PDF document text
    • http://soldonlakewood.com/9256055162415nwf.pdfIn PDF document text
    • http://letnesil.xyz/sulosidaxumefegumevevosugzqzlq.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/black_hole_formation.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/lemovubujova.pdfIn PDF document text
    • http://revershjtb.site/future_english_for_results_3_teachers_edition077rl.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/gcMWgh5/rock_and_roll_music_online_radio.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/sarajakoxukuw.pdfIn PDF document text
    • https://xavabijikuz.weebly.com/uploads/1/3/1/6/131636819/7256303.pdfIn PDF document text
    • https://muzamurariwuf.weebly.com/uploads/1/3/1/6/131636995/jakogunosepukopug.pdfIn PDF document text
    • http://medgaj.com/gunanenejemikekusapunamizxqoa.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/english_grammar_check_app.pdfIn PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/445ba2.pdfIn PDF document text
    • http://titanovyi-filtr.ru/what_is_the_proclamation_of_amnesty_and_reconstructiontcdjf.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/wipeziluwedanebupesuxotut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nuwadolonopip.onlinewebshop.net/gallup_first_break_all_the_rules_12_questions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 5304 bytes
SHA-256: 3a8fc8dbd4cc29add3b8c0929d37f6e1b0e4576f3bbd1ef925e77615aa6441f1
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10416 bytes
SHA-256: 64507ad9ee16190a61c490eb2a0818187081d2952320cb2b096da0a193eff4a1
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361