Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c36eaaf9a02d996…

MALICIOUS

PDF

75.6 KB Created: 2021-02-14 09:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 68ed05ceaa533e6a83e7ec42e1b88a93 SHA-1: ae6af64f2f0b5603ff4931d5ba368727bf00e245 SHA-256: 8c36eaaf9a02d9960d7cf7e6f2fb947d7a15009e6606d817d7a235f41a3e7e79
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to drive traffic to potentially harmful websites.

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://jottigo.ru/wix?keyword=balancing+chemical+equations+worksheet+middle+school PDF link annotation
    • https://cdn.sqhk.co/kisudosus/Vj0Shjz/gukimilopenixi.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/aJVibUX/playstation_5_best_buy_cyber_monday.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/aaron_blaise_brushes.pdfIn PDF document text
    • http://usesoda.pro/combined_gas_law_practice_sheet_answersor3jz.pdfIn PDF document text
    • http://hookup154.site/moxisifuzixavijipelopumix7byq.pdfIn PDF document text
    • http://sushibara.net/colorectal_cancer_prevention_guidelinesqhgun.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/gc1ifJQ/wutezoletesafapuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/gdidial/bonilobotupunorunabakip.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/je1jhhe/voxal_voice_changer_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kemomonil/iejfTii/dimapaxeju.pdfIn PDF document text
    • https://jitosagar.weebly.com/uploads/1/3/4/3/134318128/1871964.pdfIn PDF document text
    • http://vidclips.design/administrao_pblica_para_concursos_renato_feniliayxtd.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/d9eeac24636d89.pdfIn PDF document text
    • http://zogagutezuwe.22web.org/font_awesome_4._7._0_icons.pdfIn PDF document text
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/nemesejelox.pdfIn PDF document text
    • http://bestsaleshopin.xyz/boy_scout_uniform_patches_sew_wherej493d.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/87d6645fa79fd42.pdfIn PDF document text
    • http://yewes.space/problem_solving_approachgowvu.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/hjGgdTI/green_pepper_carbs_and_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/haggyid/ludo_world_ludo_superstar_mod_apk_download.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://tajomum.epizy.com/eyecloud_camera_manual.pdfIn PDF document text
    • http://susodiwur.epizy.com/characteristics_of_phylum_chordata.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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 5564 bytes
SHA-256: c061e428f0c025e14177ab7ded1ce86b5679dbc46b76092a59006e3e05e1acf5
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 9972 bytes
SHA-256: 8dec5f787440d15f0ca99f2f0ab67d4c146452867de6e21d9889452a6f81a5d1
font_02_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f