Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21fdfd58e4da2ae…

MALICIOUS

PDF

100.5 KB Created: 2021-03-09 20:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e94444ab5ee0f99844172ff3ba7a2f46 SHA-1: 52e7547e35f90d5467630e80c239f6bd199a6e0f SHA-256: a21fdfd58e4da2ae4020e504d87dfa060d11b76c3665a2c1713370763f51b5cd
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 0.9990

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://soxebez.ru/aws?utm_term=dbt+skills+workbook+printable PDF link annotation
    • http://tb-films.ru/5067063805266nly.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/dd6ded387ba1b4.pdfIn PDF document text
    • http://halfraire.xyz/how_do_you_set_the_time_on_a_onn_digital_clock_radio5e094.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/finegokejorejol.pdfIn PDF document text
    • http://trickyturkey.com/sistema_urogenital_embriologia_langmandswtk.pdfIn PDF document text
    • http://emirofficialzm.com/android_google_assistant_developerfjktx.pdfIn PDF document text
    • https://nivikaxixigimom.weebly.com/uploads/1/3/5/3/135322477/f8525ad175.pdfIn PDF document text
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/bitizedelumuve.pdfIn PDF document text
    • http://frukt.space/full_ethiopian_movief6fd7.pdfIn PDF document text
    • http://gladkoe-telo.xyz/auto_off_biddeford_blanket_says_edv2az.pdfIn PDF document text
    • http://kelnoteres.xyz/owners_manual_mercedes_gl450pjz7t.pdfIn PDF document text
    • http://rodina38.ru/btec_level_2_performing_arts_draman1728.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/velujafinuz_duzonalag.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
    • https://uploads.strikinglycdn.com/files/5749f6cb-8998-444f-84f0-cc900362e263/kenmore_elite_he3_gas_dryer_not_heating_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321ad4b8-3cb3-4bb0-b36f-a97ba750d763/dragon_ball_manga_full_color.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/samsung_grand_prime_pro_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2a1f33-cd6c-4ff2-8c32-01f84d6798b4/california_rental_agreement_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dcbc53-d30c-42fc-83da-3b5eb3bbb8e4/boy_scout_wolf_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4636a75a-a716-4f8e-8ec2-9d2c359989b5/vokevaniwitelovir.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/taco_bell_bean_and_cheese_burrito_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3197a767-8214-43aa-8525-b9d5913f8875/samsung_a10_screen_replacement_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112278aa-43f1-4c32-8eff-5d06754f7107/nanajovoziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c8de78-ccc1-416b-9872-0d1a18d2caf3/which_tube_has_the_highest_lipase_activity.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_off000140f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F1 4896 bytes
SHA-256: 706a14483468a0c4d209c28f412f2952ced182f1e9a79ce969830ddfff2898d9
font_01_sfnt_off000151a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A0 10760 bytes
SHA-256: 24108163c80a95adac123169e39baf36fd3148a469df5779413df84b65ac75cf
font_02_sfnt_off00017669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17669 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361