Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfc5a46362d6732…

MALICIOUS

PDF

71.7 KB Created: 2021-05-10 15:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf7835ac923aecad7ee4ef1e900c540b SHA-1: 246642837ae77b39bf28fa5f449c1e842a083201 SHA-256: 5dfc5a46362d67328aa8133ac9aa9653c6fb901e401e9432bc0eb749ce319a3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=acordes+de+titanic+para+piano PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fec72edb3846.pdfIn PDF document text
    • http://witomemu.scienceontheweb.net/17729739207.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/citizen_nighthawk_promaster_eco-drive.pdfIn PDF document text
    • http://poboxabirukus.iblogger.org/noxavezusopowapesiwaxi.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/fadegesunerobukavilulibin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6068a50f10a14.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/sutujulilixavebava.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/ap_lang_essay_grading_scale.pdfIn PDF document text
    • http://summer-italy.fun/husky_20_gal._vertical_electric-powered_silent_air_compressor_reviews8gljw.pdfIn PDF document text
    • http://hellovendi.com/300190345171ipgk.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/read_tamil_books_online.pdfIn PDF document text
    • http://noruzugakad.22web.org/la_la_land_cast_emma_watson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_60250223690fd.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/14042031780.pdfIn PDF document text
    • http://palawawez.mypressonline.com/47511774136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_604d6c61daea2.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://jigutur.epizy.com/bigopox.pdfIn PDF document text
    • http://gipanitefoj.epizy.com/b_pharmacy_ka_full_form_kya_hai.pdfIn PDF document text
    • http://fejolisevew.rf.gd/gluten_free_diet_bad_food_ideas.pdfIn PDF document text
    • http://jupukatovukupi.rf.gd/best_physiology_books_to_read.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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 4812 bytes
SHA-256: 045e7612893f5035522e28c73b836d3958f4f28ce79ab14515ca5283bd202d07
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 11696 bytes
SHA-256: 6b141ec3066f039ba96657e368bcb207bde3c2ce31e13788126af90fc68ded11
font_02_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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