Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c913a56c88e3f2…

MALICIOUS

PDF

80.8 KB Created: 2021-04-11 10:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f385af7bc25f95314b36c5dcd990c870 SHA-1: 3665a94f85e19f0574cce27483dbcba4933af468 SHA-256: e4c913a56c88e3f2b504d26c559050333cc322af2f0651e1295ee6a2d4e910bc
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains a large number of external links, many of which are designed to mimic SEO-optimized content, likely to trick users into visiting malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is a phishing attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=what+does+economic+impact+mean+business PDF link annotation
    • http://golosa-spasibo.ru/technical_product_manager_interview_questions_and_answers8clmt.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/EnV4Hhe/vesugibizakagodo.pdfIn PDF document text
    • http://beststudent.fun/english_vocabulary_words_for_kindergartensrikr.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/FhfijFZ/5717747637.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/40785772170.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/gjgc3lk/download_rush_hour_3_netflix.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/canon_7d_specifications.pdfIn PDF document text
    • http://autocredit.moscow/96543252186in4b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/53k94tP/95425161820.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/c3bhft7/minecraft_zombie_apocalypse_mini_game.pdfIn PDF document text
    • http://sodahq.club/pazosibopagogudawopibajohvs4e.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/lekudodikidutet.pdfIn PDF document text
    • http://habirovradik.ru/69145515285xqumy.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/worugi.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://s3.amazonaws.com/nitidadufetenu/5258019340.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/fozinepekupobewukuv.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/beachbody_performance_line_energize_ingredients.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_c4553e3bc39048b4a5667afffadd355a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/gufebupogomaziw.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/canadian_passport_renewal_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/is_my_vizio_a_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/craftsman_5.5_hp_24_front_tine_tiller_manual.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_27555e9ca73c43c19f2cef9369bacbf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/nutejenugekilejoregog.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/70957398772.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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 5220 bytes
SHA-256: 96ce60dc639380e3d073f91b7613b35dd30c4c86b7a3bad9eedbbc0cd9ce6aec
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10908 bytes
SHA-256: b4290ead877e25be871264eeb10ac85ec600718839910077d716500611e3f01b
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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