Malicious PDF — malware analysis report

Static analysis result for SHA-256 a252eb201d5ad687…

MALICIOUS

PDF

75.0 KB Created: 2021-05-22 12:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1472ada7cdb6a470d6f670219903b2d0 SHA-1: 218372402259723bb0cda944060e9abb2c9a9984 SHA-256: a252eb201d5ad687735656e9f306846dbd0712dcf33d963cd54712493ca4688c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://ponafet.ru/strik?utm_term=actividades+para+segundo+grado+de+primaria+2020', likely serve as entry points to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=actividades+para+segundo+grado+de+primaria+2020 PDF link annotation
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/cb5c58562.pdfIn PDF document text
    • https://riwinuwozobama.weebly.com/uploads/1/3/4/8/134868589/padadaf_wosexe_dodosidop_risuxo.pdfIn PDF document text
    • https://jatomotubaw.weebly.com/uploads/1/3/0/7/130739460/xiwalevilopori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_606cda4d034ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_604e3d2db53f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_60195395428da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fee256ad615b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d7e472f10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_5fcea5c9159b8.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/vajutizipal_suweserapoj_fabalasezan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_601af36e8c717.pdfIn PDF document text
    • https://nuzopilubejam.weebly.com/uploads/1/3/4/4/134459065/vakijunoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_6029031b6096e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fdad7a5e37cc.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/297574.pdfIn PDF document text
    • https://fekujerixotose.weebly.com/uploads/1/3/4/8/134896765/waliropufilek-wesofemavigezed.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/buxalawo-ganewer-xoxuzemuw-pepufeleroboj.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/wazutudagegudud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e64c66e-12a5-40ae-9a1b-babc5bf583f9/what_is_a_good_amc_8_score.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/parrot_ck3100_pairing_failed_iphone_7.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/laregegokivewegusixu.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/meaning_of_cheliform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbce53a-5a70-4060-a910-77c2b3446375/dikalibenul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5147f4c3-7693-4a97-9c50-81c550fe04b2/618739946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d71ae31-b606-49e8-99b3-1b172aa63ad8/kitaneranavopukak.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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 5684 bytes
SHA-256: 6afa6805c02ff4eace327afeb26de1efdf1e39c946e29f528de320c4361db98f
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 11636 bytes
SHA-256: 9731531e842c83a864ed1d8cbe862fbfa3875bcfd490bf4416608b312fa389c8

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