Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f8da26f8fba136…

MALICIOUS

PDF

72.6 KB Created: 2021-02-27 21:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 62c184b5b2b1c0e3206252f0cec14e0d SHA-1: e5221f618296bc5b5f45226883e6f33ccb0b18d1 SHA-256: 19f8da26f8fba13625194d4c484db56a008d568980dd6dcae629c2150fb4a256
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'https://xajibur.ru/wix?keyword=tkam+chapter+1-3+questions+and+answers', suggesting a lure for credential harvesting or further malware delivery. The PDF structure also indicates it's part of a link farm, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xajibur.ru/wix?keyword=tkam+chapter+1-3+questions+and+answers PDF link annotation
    • https://padobijitoxu.weebly.com/uploads/1/3/1/0/131070591/404be.pdfIn PDF document text
    • http://wavosebiza.22web.org/pupuk_organik_cair_bonggol_pisang.pdfIn PDF document text
    • http://lazadacostumercenter.com/53089612350xd394.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/mipinuda.pdfIn PDF document text
    • http://segway-wheelchair.ru/35326390001g64j1.pdfIn PDF document text
    • http://jezoxegodugorol.22web.org/michelin_guide_nyc_2019.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/javascript_template_literal_object630za.pdfIn PDF document text
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/tosezubetib.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/8222854.pdfIn PDF document text
    • http://butinejijobu.iblogger.org/85460943036.pdfIn PDF document text
    • http://pek-24.cc/trace_mobile_number_current_location_through_satellitedvqlj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibupozikijebi.rf.gd/ce_declaration_of_conformity_sample.pdfIn PDF document text
    • http://venavabumekaj.epizy.com/spider_gwen_comic_1.pdfIn PDF document text
    • http://tebafifara.rf.gd/banner_background_design_template_cdr.pdfIn PDF document text
    • http://tinipolevuzow.epizy.com/business_plan_template_landscaping_company.pdfIn PDF document text
    • http://javuxanasojajex.epizy.com/wuxudugifatinesidurozi.pdfIn PDF document text
    • http://zukuvib.rf.gd/ludebikul.pdfIn PDF document text
    • http://pavebutom.epizy.com/chaalbaaz_movie_720p_2018.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 5760 bytes
SHA-256: 5a3857974522d497bbdbeacbc587e01df999fde9c44f7effa05f3ddde17089f3
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 9856 bytes
SHA-256: f66c5e64395a3b1be2da7dab2db6f0d9092855eeb1e6c345e94f5866cec698c2

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