Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f88018b4d78d25…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 22:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a24fd69b90b791a317af41fe87cf2690 SHA-1: 5ccf52451e02517e518e680b0013bce53cfe73e4 SHA-256: 63f88018b4d78d259cc90afae6aa1fff88cefa7fdf7d44964ae7fc4bfeb04df3
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, https://midufefew.ru/award?keyword=indefinite+articles+rules+pdf, indicates a lure to search results. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=indefinite+articles+rules+pdf PDF link annotation
    • https://botutubinev.weebly.com/uploads/1/3/1/6/131637728/6025877.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fNdPCxj/dumupevolijev.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/tTjbocc/tagagixurekoxefunoxe.pdfIn PDF document text
    • https://zabagogaj.weebly.com/uploads/1/3/5/3/135313674/4358175.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/nopoxovowevikek.pdfIn PDF document text
    • https://xogudefimo.weebly.com/uploads/1/3/0/7/130775634/ruxesito.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/zipifesitola.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/zenebabewaj.pdfIn PDF document text
    • https://jekugisolidib.weebly.com/uploads/1/3/4/0/134097103/569418cdac962b.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/46387498623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sadigibesalij.epizy.com/gaggia_titanium_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f95d19-34be-4d8b-9c67-cfd7cb54ad75/medieval_2_total_war_games_of_thrones_mod.pdfIn PDF document text
    • http://vasakuzepilaxi.onlinewebshop.net/xosezinifisi.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_4590a015d7bd42b88e11d76be483fd96.pdf?index=trueIn PDF document text
    • http://mubidixosi.epizy.com/hailsham_community_college_sixth_form.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_ce32620c77b94138a3d83bb6a076f776.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ac401f-60bc-4291-a132-6407487f6ddb/concepto_de_composicion_escrita_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093d5e1b-8c08-4e99-8cf8-22e32043c46d/20956799146.pdfIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_a2a40d742ad94a12b3252a8e1dc6ad9c.pdf?index=trueIn PDF document text
    • http://rojanesifilagu.myartsonline.com/529661695.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_a8a32d0a6f5849f584792262cdf2aaeb.pdf?index=trueIn 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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5088 bytes
SHA-256: a2b5d18d87daf5c1809dcb6ff064396fa2ad40064f2f2ae071b3f69e4e06698c
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 11016 bytes
SHA-256: 60cbb3ca6c016924e2e855612133e3c5047cb10a42c90f036e8155e8b63a8ed0