Malicious PDF — malware analysis report

Static analysis result for SHA-256 143fee57b69c78de…

MALICIOUS

PDF

152.9 KB Created: 2021-03-24 19:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b15e5162d42354ab2063284e408a694b SHA-1: b0a981064d50fa2badd514aaa76391a6b930660e SHA-256: 143fee57b69c78de586b611681228b57203d1727a94f6fe0d3327bfed57adda0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/wix?keyword=adobe+audition+cc+manual PDF link annotation
    • https://cdn.sqhk.co/kagixepo/Dhfjbha/zitorobun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5ff8332370312.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/0ighbha/83827916543.pdfIn PDF document text
    • http://startbastar.online/tekin_rx8_gen_2_combo9ortb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_604d188a8704d.pdfIn PDF document text
    • http://prizinsta365.online/free_natal_chart_report_online24bzz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_601a534080266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6047dd85ee589.pdfIn PDF document text
    • http://in-step.shop/2891933255406m8t.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/sGmiije/desiree_nosbusch_1._ehemann.pdfIn PDF document text
    • http://helplnstagramoffice.com/practice_act_test_2017p2y8t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370987/normal_5fce60a4ba469.pdfIn PDF document text
    • http://alphabitx.com/13836932594fu6rk.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/sajezife/battlefield_4_dlc_size.pdfIn PDF document text
    • http://kovudefimure.rf.gd/white_party_background_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b36504-f02c-4c7f-bde4-88626c55537e/xaviwisir.pdfIn PDF document text
    • http://tugepujato.rf.gd/basketball_background_free_s.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/87687718770.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/wevokezoxexi.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/bebejodabofelexiviwonimab.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/gta_3_missions_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f9faf5-1339-4688-a88b-ce6e35626a0f/93341818683.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/fedesazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc0ada6-7bdb-4c18-b81d-349962d836bf/xuminal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e8f18e-3d28-48b9-b50e-e42203893794/tuwuwuvizodepozure.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_off000219af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219AF 4940 bytes
SHA-256: ada317051a9c2a4362e15cabe45cd71d329e226096e3c82b068379e052b2f26c
font_01_sfnt_off00022a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A6C 13164 bytes
SHA-256: a128f1e2d251cf4ab6d5afd932830691bcc67f4de06dcad3d233ef14c4539d14