Malicious PDF — malware analysis report

Static analysis result for SHA-256 914156adb04e77c1…

MALICIOUS

PDF

95.7 KB Created: 2021-03-28 11:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f9baa6e45058d4396c06c920d5b18a6f SHA-1: 2acd37d019dbe03ac878dc35d3e29b48587be95a SHA-256: 914156adb04e77c1b32bf53beb126175df926d020a15a9744eb311991392caee
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 0.9980

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/123?utm_term=terraform+s3+bucket+policy+module PDF link annotation
    • https://cdn.sqhk.co/xabiximakef/bjdPjht/reigns_game_of_thrones_ign_review.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/g7zJQje/28990388212.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/7238076.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/c5c1d0117c37.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/pQMvhjm/amazon_kindle_store_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/hjjdjei/mobile_strike_game.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/ghechiI/xijikijojalapojajonidonu.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/ijchbjj/learn_dev_c_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/bayjgRl/.pdfIn PDF document text
    • http://ezfix.asia/how_colors_relate_to_emotionsnt801.pdfIn PDF document text
    • https://xuxudufekew.weebly.com/uploads/1/3/0/8/130873992/7596050.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/sizavobaliva_banikupu_gilobigojor_sanep.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hjdrgij/43869062081.pdfIn PDF document text
    • http://becloud.website/53421648811jyt0o.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/7vKggSh/horse_jump_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jigMuMo/learn_how_to_learn_anything_faster_udemy.pdfIn PDF document text
    • http://hyipinvest.site/creative_email_signatures_templatesqu4cr.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/jinabom/neptunia_re_birth1_shares_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/presentation_ideas_templates.pdfIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_c8322aa02c0240a8acb1611d96995e29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/knee_arthroscopy_exercise_guide_aaos.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kabali_tamil_full_movie_free_tamilgun.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_d22b0b430dee43ebb6aa235a1d3f92cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizedumi/vadepokivemoromijoxowede.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 5720 bytes
SHA-256: 546ae8919ad89a20320066f096d04a5969a92c487d90c32fb6d34a432b02028f
font_01_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 5216 bytes
SHA-256: eadb7581bac0dc69c14429d0d92285c39936d4bb1ec3a84a2dcba98caef79aac
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 11996 bytes
SHA-256: 77efbd06f47ee806d743e13f10a760ccf50d616095eee63ff0a7dbcd8fa230dc
font_03_sfnt_off00015b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B03 16232 bytes
SHA-256: da37c42525f3f1630f644ffdc44cb77fb5190f60019ab5888bd63186916df2a3