Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1785c9f8fb1b9fa…

MALICIOUS

PDF

73.2 KB Created: 2021-02-12 19:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b7461572ae3ea8e9390de8187815216 SHA-1: 5dea53b87dff05dbb41a92f82ff8f9b0ac350b20 SHA-256: f1785c9f8fb1b9fa8120a8266ddb7491c1f509b1c287997e12c6007db1e77d2a
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 high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure disguised as an educational worksheet.

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://baarspo.ru/wix?keyword=parallel+and+perpendicular+lines+practice+worksheet PDF link annotation
    • http://dvertsoff.ru/picadora_de_hielo_manual_chile6adep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_600db43479b47.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/sE7ja4w/muziwuwilevag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370280/normal_5ff68ef655758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_601b44b4ef007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_600f5f27ad331.pdfIn PDF document text
    • http://idealicacolumbia.site/kurezodonea6hkm.pdfIn PDF document text
    • http://songkfrk.site/11898227688pj4ni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_600420670d3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_60184f29e575d.pdfIn PDF document text
    • http://top-odejda.com/surah_yaseen_ka_khas_wird_mubeenw0hfp.pdfIn PDF document text
    • http://snatural.space/wonder_woman_helplesskahe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382780/normal_5fdd82906b29f.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/jS35hg6/12726520532.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/lucky_block_minecraft_ps4r39h1.pdfIn PDF document text
    • http://mybiol.site/73244897346vjk0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novegiw.rf.gd/albee_al_koba_mixtape.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/edmodo_apk_mod.pdfIn PDF document text
    • http://sozizuw.rf.gd/al_quran_karim.pdfIn PDF document text
    • http://ninanupazazudad.rf.gd/sample_music_brochure_templates.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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 5320 bytes
SHA-256: 8efd93538f57708c08c324f6be6d6436ddc3be479d143215bece97dc979b30b1
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 9900 bytes
SHA-256: 1e60a90fbb340d6640563fd9b75f395d4e52e26e593c13ef7c16bff1fba98fad

Open this report in the interactive analyzer, or submit your own file for analysis.