Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c8b2de2ba926f0…

MALICIOUS

PDF

62.1 KB Created: 2021-02-17 02:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26623f3852f48c76a5eb2290855c8207 SHA-1: affd50b5f9bdb8f0be379ab65083ee5f4f7dc447 SHA-256: c2c8b2de2ba926f082e585add930ec186aa880a26ed86d061275c30b493a9f16
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one pointing to 'bologen.ru' with a query parameter suggesting a booking application, likely a lure. The PDF's structure and embedded links suggest it's part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=conference+room+booking+application PDF link annotation
    • https://cdn.sqhk.co/pazaxefuma/ebhf3hi/30559654371.pdfIn PDF document text
    • https://cdn.sqhk.co/lotuxuduvoki/jgYo42o/besejarisebumifowuga.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/gh2igFI/nazaxeneluwenom.pdfIn PDF document text
    • http://vedice.ru/brush_digital_painting_photoshopqfglu.pdfIn PDF document text
    • http://nextauto02.ru/keystone_algebra_1_geometric_sequences_answers25ixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380228/normal_6000017c29646.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/hjFjehj/27499676181.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/ohiiiie/what_s_your_story_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/if4eijK/unlimited_diamond_in_head_ball_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_601dd873893a3.pdfIn PDF document text
    • http://repochka.site/hoop_new_friends_on_snapchat_apkciqo4.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hrjgib9/62698070445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ff6a7b0aa677.pdfIn PDF document text
    • http://mon-cmbretagne.best/88779050258ppr7l.pdfIn PDF document text
    • http://teaitalis.space/double_cross_answersyb9m4.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/vCDbbjg/sell_on_etsy_uk_login.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/j4DOP7f/virus_estomacales_tratamiento.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/vixozijo.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/radical_candor_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/bsc_nursing_syllabus_2018_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/bulldog_sticker_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/performance_appraisal_phrases_for_work_attitude.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_off0000b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 5264 bytes
SHA-256: 4e3eb5e1d2a14ff779dce9912f62db9274a174a297422fe25b3a5b9bf46c3e10
font_01_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 9320 bytes
SHA-256: 61613cf964fb569dbd1488a727747ec1cf3748592aa31df1cf6dcb8676f3de8b

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