Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f03c8a90671383…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 04:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 20a06affbc328567dfd5db6922219331 SHA-1: 361ba7ab4665ce905152a177792e6f8b6a408555 SHA-256: c3f03c8a90671383e8274db939cbab754475abbb6071b6fceaeef831dd29083c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/123?utm_term=artrosis+sintomas+pdf PDF link annotation
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/jefuzitak.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/nursery_rhymes_for_babies.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/is_there_a_sequel_to_the_dark_tower.pdfIn PDF document text
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/govejufikefuw.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/4.3_mercruiser_engine_oil_capacity.pdfIn PDF document text
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/09ad45bfbef8cd9.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/43815875328.pdfIn PDF document text
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/zuwoxije.pdfIn PDF document text
    • https://bajurajatug.weebly.com/uploads/1/3/6/0/136054821/6500464.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/1bb1ac74eaa9.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/d2ec5e537.pdfIn PDF document text
    • http://pokavitapizinuv.iblogger.org/information_sciences_and_systems.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/e1d666fd12b.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/55375177270.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/how_to_fix_timer_on_ge_washer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudukamu.rf.gd/fikefipoviran.pdfIn PDF document text
    • http://sirerig.epizy.com/kujudera.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/18332407203.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/rogers_anyplace_tv_apk.pdfIn PDF document text
    • http://vutakeba.epizy.com/nara_japan_tourist_guide.pdfIn PDF document text
    • http://godavuvexo.epizy.com/agarbatti_business_plan.pdfIn PDF document text
    • http://fefekug.rf.gd/bootstrap_admin_template_php.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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5144 bytes
SHA-256: 6b9aed40e888e98be79fff3026b552af8de3882840a3827998670558bf35e1d0
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10784 bytes
SHA-256: b3c56150449de19ee2f0db1fc4c6af3f7ed5c298f759da8b25a4bc6cfedc458b

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