Malicious PDF — malware analysis report

Static analysis result for SHA-256 8359cbdaec4addf9…

MALICIOUS

PDF

80.2 KB Created: 2021-03-05 01:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fbe4425b0337692dd10f5e661d3b3af6 SHA-1: bea1a0a4fb1873c385807b2e8bba4cb840a136a0 SHA-256: 8359cbdaec4addf93493833db9720c6d4336cb631e3b9b2c69d8aae17a2dd2f4
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URIs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=cbro+value+list PDF link annotation
    • http://wagagawoduzom.iblogger.org/stickers_whatsapp_memes_apk.pdfIn PDF document text
    • https://fuxobubexozemag.weebly.com/uploads/1/3/4/7/134752644/6503913.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/o7hbgfO/lannister_helmet_replica.pdfIn PDF document text
    • http://nexusisuperat.22web.org/gezozigi.pdfIn PDF document text
    • https://lekodapodigix.weebly.com/uploads/1/3/4/5/134500142/81f509c446.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jfvgchg/giruderiwij.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/i7oRjf7/jukoxigamufegipogagekuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/39Xgev5/vexukije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potelodifudoduj.epizy.com/bujipevojuvowusob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0187a8ff-08ea-435d-8a7a-e94b3298fc1b/what_is_an_inbreeding_coefficient.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81339556-ff5d-4a83-af3f-888f81cfb326/toturakebivibod.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/winning_performance_britain_s_got_talent_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687c4c1e-17fe-4ef1-9f17-428400ff6378/oracle_sql_case.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/jusawafawatudutav.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/90272175546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b928584e-4835-48f9-96f4-640a29d223a4/21440465757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f9d954-fc61-46ed-9da6-af1e26665531/97614328303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a291da-31b3-46cd-98bc-261eb02e88cd/80751891823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7ddd6f-650a-41db-9728-15d7193dbaa8/norutufesikarejusadasin.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_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 4784 bytes
SHA-256: 479e10f784f43b061231547a78935f7a4f07cb232d5b90cb57c3adace77df145
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 11152 bytes
SHA-256: d7fffd3d91d626b73b3bd0cb86f4d2e5b2f178d9ef5d255334de9223b14650a6

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