Malicious PDF — malware analysis report

Static analysis result for SHA-256 1645d2a49d4b0d30…

MALICIOUS

PDF

97.8 KB Created: 2021-05-15 19:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 25e073d8131ec834009cafaca88b507b SHA-1: 26d5627098ee54fad4140b68b4c5ca7e66edb32e SHA-256: 1645d2a49d4b0d30c2f73de78308ad55a9790bdb915d101ffe60a91371a5b7e5
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=what+best+describes+the+french+third+estate PDF link annotation
    • https://cdn.sqhk.co/tudosiki/eichhiu/anaconda_snake_simulator_apk.pdfIn PDF document text
    • http://zanapipok.getenjoyment.net/bruchrechnen_arbeitsbltter_4._klasse_volksschule.pdfIn PDF document text
    • http://it50life.pro/31342300577f98qp.pdfIn PDF document text
    • http://reawolt.online/80229654494cqxl5.pdfIn PDF document text
    • https://cdn.sqhk.co/vijasezadida/QHiaCuF/spirited_away_haku_age.pdfIn PDF document text
    • http://bazis-rostov.com/sofalomasiwijak3e1a.pdfIn PDF document text
    • http://gigogon.22web.org/glencoe_algebra_1_answers_chapter_7.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/I1yojaR/26769190047.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/i6hdice/screen_recorder_audio_video_recorder_apk.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/smoothie_detox_recipes.pdfIn PDF document text
    • http://vbruti.site/gafomv9ipv.pdfIn PDF document text
    • http://expressday.online/78444841442l12e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_603994ff2f350.pdfIn PDF document text
    • http://findssldz.xyz/negisutan7djm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6069f314e4b95.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
    • http://refuzopil.epizy.com/88808697935.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/best_high_school_biology_textbook.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/kufilogufonevat.pdfIn PDF document text
    • http://safilizejodi.epizy.com/function_in_excel.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_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 4908 bytes
SHA-256: c5865966a731eb1c2e7658740399dbd8011f6e4a7ae55a2b6d2b5652fbe7913d
font_01_sfnt_off00014768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14768 10628 bytes
SHA-256: b23b930bbcf80c7d258d8f1265e697451da15029aae0ca8921001c32131cd2f8
font_02_sfnt_off00016b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B46 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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