Malicious PDF — malware analysis report

Static analysis result for SHA-256 024fa6367f6061f2…

MALICIOUS

PDF

70.6 KB Created: 2021-02-28 08:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6de06e7a4e2820a56c8333c8015ceb17 SHA-1: 2849b45c05df5bca4c7c1e66bc5989a6d6a9f216 SHA-256: 024fa6367f6061f28daebe5cdfa07eb80e98f8b754dff8cc88ec7678703a78d2
126 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 ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to "Learning spark 2nd edition download", suggesting a lure for users seeking specific content. The presence of numerous external URLs, many pointing to disposable hosting and link farms, further supports a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=learning+spark+2nd+edition+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ffd07389caa9.pdfIn PDF document text
    • http://faladen.22web.org/xojegeratinagudiroboxep.pdfIn PDF document text
    • https://xozuwowofar.weebly.com/uploads/1/3/1/0/131069921/mamowagi-povamodagu-kitezinaz-rabuxoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_602782a03fcb2.pdfIn PDF document text
    • https://tigepofawi.weebly.com/uploads/1/3/1/0/131071288/vefuresavufewe_dudatogu_wokotivo_zitewajomirudos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_5fd0ba6373e58.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/AVsijfg/dragon_hunter_crossbow_or_blowpipe_vorkath.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_602b5f0ca8649.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/ISmjeii/university_of_montana_law_school_admissions.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/GPgejgn/bopalaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_601a298282cca.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/BaichhJ/short_stories_in_english_with_moral_written.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fca5b5520d43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fee3f4dab5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415068/normal_5fe558aeeee9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenujasope.epizy.com/kiremavitexekodoxevo.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/39438901274.pdfIn PDF document text
    • http://pamakejexo.epizy.com/pibezujolar.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_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5356 bytes
SHA-256: 2943af87b8fcdb5238703d4f265eee61281c5490630e64ba5102c13fb1ca11fd
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 10596 bytes
SHA-256: 7fc691cd3defde187da0aa8bc7724b645522380392bdeb3b786cc1676827b9b3

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