Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad3faf325e5150c…

MALICIOUS

PDF

74.4 KB Created: 2021-05-11 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b2c2d26fe759a87fc0d297eacad3dd33 SHA-1: 732c010a474de2af01a1de4c1be3d587102fbeeb SHA-256: 1ad3faf325e5150cfb1787df67d8e53743c3ab39ae240130ba1c73df31fc8cfb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=ejercicios+de+porcentajes+7+basico PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376601/normal_6005276346323.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/sapozopowewote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5fe9404fd69bc.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/fudabe.pdfIn PDF document text
    • http://kotopujofolebi.22web.org/apprendre_apiculture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pubopelej/mudupejonujanofomozapa.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/37659282531.pdfIn PDF document text
    • http://xetorofowuwid.epizy.com/zubezinawa.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/dragalia_lost_weapon_crafting_guide.pdfIn PDF document text
    • http://surotipetufamam.rf.gd/suwimiguvibavemasoxuko.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_c62ed4f171d24d4e8513a8ddb48417b8.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_89892ca761874bc7911598126a723d7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusori/answered_prayers_danielle_steel.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/dell_optiplex_790_cmos_battery_type.pdfIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_eb867e465e8b49aeb456815a3e0ef442.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_82fba1e6d30d4de2b8b655aae7cf11f0.pdf?index=trueIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_7eed360f79f74d10beb052aa93581c6f.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_771e34c72b084d778043a84adefa7c94.pdf?index=trueIn PDF document text
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_9c4d1716e1e645adb9db3bd26fc0979f.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 5288 bytes
SHA-256: 8cd172457dd44cc2f85fcb88546f785bcc7a9e25f672e2e514d5527a004de59c
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 12296 bytes
SHA-256: c8f70b0f4ac94ba68c6b34e3d0c69170a765eec5c1cdb06fc6f5a8d56e91c862

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