Malicious PDF — malware analysis report

Static analysis result for SHA-256 44aec86e79ef9a1a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-20 21:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f57a635a66a01b76f04294d329f344af SHA-1: 710e0ba4dbb72bb2a5286abaff20d981a5f7d895 SHA-256: 44aec86e79ef9a1aa9b65dddde4e72874d5c09df2f10600cac4660dcda8cd652
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The embedded URL, 'https://crophysi.ru/strik?utm_term=complete+the+food+chain+worksheet+answer+key', is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery. The document body, though truncated and obfuscated, suggests a pretext of providing an answer key to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=complete+the+food+chain+worksheet+answer+key In PDF document text
    • http://foodguideblog.com/786813121425yoeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_6026ef6c552f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5febd46d4ef8a.pdfIn PDF document text
    • http://study-english-05.site/holt_mcdougal_geometry_answers_chapter_6cvc27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_602608e284cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5fdac4e5d665a.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/jjihjA2/mini_warriors_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_602cdaa933c41.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/V5hdkIe/kosuvivononifonudupomupit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_60278077ad30b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388158/normal_5fed10de9630f.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/jhRvcha/barcelona_music_events_september_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/cidhbjc/tizobotipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_602400103a5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_602f20e79b5b7.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/jdkNV9G/zevagojunufitobunimabu.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jhigNgd/lemurilapirejejutagore.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/vazisi/complex_ion_ligand_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/land_registry_practice_guide_lost_deeds.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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 5560 bytes
SHA-256: 5be8b1e1c6c1d463ced85c24db0a299157355497ebadab65b213dc8d1e84cccd
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10860 bytes
SHA-256: 81446300b4b987fdf240aa3058a02ba357780a22240093e3dd91ef4ed4523e16

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