Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7a0f7b25be46c6…

MALICIOUS

PDF

84.7 KB Created: 2021-03-17 17:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5be84cf634456cb4b972eb44c0385440 SHA-1: eaedb86487dc5b68885a636d9773e7a5fc09ed5c SHA-256: cf7a0f7b25be46c613469392cada58d0c4421e512c6f16989c24e4faeedaeadf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious websites. The primary attack pattern observed is the use of embedded links to lure victims, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=christiansburg+va+apartment+guide
    • http://ginumon.iblogger.org/the_happiest_christmas_tree_sheet_music.pdf
    • https://cdn.sqhk.co/vumusokutil/9Ziinje/pro-_cut_belt_driven_slicers.pdf
    • http://badgesverified.com/kepuvurkzve.pdf
    • http://formblckr1.xyz/selenium_c_tutorial_videosspost.pdf
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/fc6a02f6cc7fba9.pdf
    • https://cdn.sqhk.co/xedasuzefer/PwoDEgj/hoodie_buying_guide.pdf
    • https://witatike.weebly.com/uploads/1/3/2/3/132302928/589207.pdf
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/vozevo_lovikewasaxowez_pabajuzodepako_disit.pdf
    • http://sport-stavki.fun/jumperoo_weight_limit_kgtje4v.pdf
    • http://dirujadejefogax.iblogger.org/ti_30xa_manual.pdf
    • http://wiinorama.fun/nero_8_ultra_edition_serial_numberjxkwb.pdf
    • https://cdn-cms.f-static.net/uploads/4457590/normal_604aa342f3eb4.pdf
    • http://usacreditmonitoring.info/27128627591xmgxl.pdf
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/2808728.pdf
    • https://kazimiposaduvab.weebly.com/uploads/1/3/1/1/131163956/fuzesasipas.pdf
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5fdf812bd8fb3.pdf
    • https://cdn.sqhk.co/niramojiga/J67hgS6/cloudflare_status_twitter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55cb28e9-9964-4698-8e2e-999235aa6516/daily_english_conversation_practice_by_topics.pdf
    • https://uploads.strikinglycdn.com/files/e1d08a7c-2a95-4863-92a3-3566d3912227/tv_ears_replacement_headphones.pdf
    • https://uploads.strikinglycdn.com/files/23ebf395-5deb-4054-956b-9b508dd87580/2012_hyundai_sonata_hybrid_sedan_4d_for_sale.pdf
    • http://gufalejev.epizy.com/google_assistant_from_google_play_store.pdf
    • http://tupazovux.epizy.com/tojerade.pdf
    • http://jawuguv.epizy.com/font_awesome_free_offline.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_off00010a28.bin
17702c4769931a1323ca6c5ccf2a59ec7988e87335a08691126ea4a1a37521b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 5444 bytes
font_01_sfnt_off00011c7b.bin
825bb78ecf2b6795da4f3534ebaa2d707b8320d23acc0f3d7bbbe98db95f8f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 11592 bytes

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