Malicious PDF — malware analysis report

Static analysis result for SHA-256 9844f263a8a496e7…

MALICIOUS

PDF

77.6 KB Created: 2021-05-19 15:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e4dc26854711e182e47accd7046bb61a SHA-1: 6634e30530f8060df00b796fcaca8f5b37ef1b5b SHA-256: 9844f263a8a496e76417e804b5fbce4f659417aca7c2a5c963761c467b9ee71f
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 0.9956

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://botokaw.ru/strik?utm_term=docker+desktop+for+windows+7+64+bit PDF link annotation
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/xikorijaradakijotazi.pdfIn PDF document text
    • https://kiwewogulexir.weebly.com/uploads/1/3/4/3/134307720/setapukurijeteb_vulalul.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/fomowobawoviwixonuk.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/vejazugimuxesa.pdfIn PDF document text
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/vosiv.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/4988462.pdfIn PDF document text
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/mozixe_kigijelunoliz_gobeveguxakumos_menesivuj.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/5708058.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/lorevub-bazobufunif-pebafasodit.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/vokisobixo_fukumim.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/6798701.pdfIn PDF document text
    • https://wezusewowanura.weebly.com/uploads/1/3/4/2/134235680/juriletoxunidevo.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/lasoloputibofe_jimezinonevidi_pinamenogib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86852437-8e62-435e-88c5-bcbee1211681/how_to_play_johnny_b_goode_acoustic_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc75d977-c070-48e0-8064-dc9ade04f84f/sura_yasin_bangla_translation_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/71044000555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bf9804-8591-41e0-8b8a-f13e05d9855f/how_to_turn_off_philips_wake_up_light_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/78408362273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ccb631-c918-482b-8f37-e5057aa6e630/68404083979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d5b6fd-d9b8-4f3d-91b6-73e9360aeedf/50834764434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779e7b17-dc94-4133-91e4-00aecd071b2b/asus_sabertooth_990fx_r3_0.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/email_regex_java_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f583cebd-d6be-446b-9f13-d6089983b345/26933423603.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/chronicles_of_narnia_2_full_movie_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/fabric_softener_sheets_allergies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d832658c-08b1-45e9-9180-655a62004a5e/ralomopolimabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d70531e-8a75-4761-bd40-50b943d2b65b/crookedstars_promise_read_online_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5524 bytes
SHA-256: b81ab9ba718ef767d96d348ca88248d4b21ef213377fe7dd6cf2a6315ce4e00c
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 11224 bytes
SHA-256: 0938634b5b0c5750adbcea406677fb4d6f00d401b6fbeeb3d1df7665f6786963