Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a64771993971e1…

MALICIOUS

PDF

74.4 KB Created: 2021-06-10 22:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4ac88069df9c7b4412310377c6190283 SHA-1: c8a798257172b97515b061ca643d1458142a121e SHA-256: 70a64771993971e1b65150c062234388ff055d0fdb7d3ee35b7bb0544ea0556e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://xezojetit.ru/123?utm_term=square+root+of+273+in+radical+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fe6b2bac1495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_606129f9d3655.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/d21c9ab4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_600f309fe8d4b.pdfIn PDF document text
    • https://bubijusafas.weebly.com/uploads/1/3/5/9/135994311/tokivo.pdfIn PDF document text
    • https://pozosukezogi.weebly.com/uploads/1/3/4/3/134386022/fufopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390637/normal_6009acd18ccc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_602c16782faee.pdfIn PDF document text
    • https://nuzubalud.weebly.com/uploads/1/3/4/1/134108962/1917623.pdfIn PDF document text
    • https://mezobemubuzopos.weebly.com/uploads/1/3/3/9/133997151/fukebonolug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_601be27e2e187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5fe9a8eab8229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_604cb83ed9c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_606d392a0dcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_6065632513000.pdfIn PDF document text
    • https://dekilaroturiti.weebly.com/uploads/1/3/1/8/131856809/rakulowobi-diwodomuxopuz-fatugulexerelun.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/cbfdfaee-d9ad-42e9-91d7-4fc21a0441da/gorisase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb362d9-8ed7-4010-b378-72aa4ba11978/7_habits_posters.pdfIn PDF document text
    • http://wixumip.pbworks.com/f/continuing_korean_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a86cbe-6664-4235-b095-1c37c71feba6/palabras_de_despedida_de_cuarto_para_quinto_de_secundaria.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/39747736172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927c71d1-fafd-43ba-9071-2af2f41ac096/stop_saying_youre_fine_download_free.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/bivuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be5a4c2-65e1-4c73-893b-d6730e6d3cfb/bertrand_russell_philosophy_for_laymen.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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 5592 bytes
SHA-256: 8fb66a5fb40a4024bde7cc395a4b5113b73d0cfbaf365c9bf75e684c3b1b2738
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10996 bytes
SHA-256: 8e7464f961baf9b5506ca2b127ebc97f229b29744f6b5bd8012db0163b8fe7eb