Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffddcf8edcc96e5…

MALICIOUS

PDF

101.8 KB Created: 2021-05-20 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7f4146d75f88953ff906e955b0e69a26 SHA-1: 63e1270feafd92249a863de2fc299ac892fa8953 SHA-256: 5ffddcf8edcc96e53ee1e508ca0eef647bcac9b29229d81101da138afa4a1132
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a mass external link farm, with one primary malicious URL identified. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+is+the+arena+challenge+in+sniper+3d PDF link annotation
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/fenimabixatuki.pdfIn PDF document text
    • https://kusugano.weebly.com/uploads/1/3/4/7/134740680/8081700.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/tofikuxedopu.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/dab33b18.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/85a2760f-0956-4d77-9145-ca1f42dcb6cc/69605017660.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/berijozafitol.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/maytag_quiet_series_200_dishwasher_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69cedcf-6f30-4e75-aab1-e19be299bb11/wapojotediwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83509a3-c9ec-447f-b0e4-3416ce6a8933/beat_racer_mod_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/android_7._1._1_root_no_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd89f96-0413-4922-9f79-96b8abf871dd/boloduwekorevuw.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/eu_ageing_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/north_penn_reporter_lansdale_pennsylvania.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/marley_cooling_tower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3e7ff8-cfa2-4cda-bd7a-1cb647ac5097/37267096295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3beb5651-7439-40b0-b720-bc2a8f065e9c/english_conversation_11.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/iowa_code_section_704.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41953a8-8cb5-4bb5-864d-f91079aa84bf/16793797285.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/11951542622.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 5512 bytes
SHA-256: 9ec0820d2cf05d0deb7d207ab17b27342d5c280fc30b4fc957bbd482f94cbda7
font_01_sfnt_off00014708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14708 5580 bytes
SHA-256: af6d7f908ce8b48fa2c4e05ef88120a724739f9b64037216c31dec6971b963b5
font_02_sfnt_off0001595b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595B 2052 bytes
SHA-256: 45161600c168cb86abea0d582939cff7e26865ccef696145a84b56b2745b4fe2
font_03_sfnt_off00016210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16210 11576 bytes
SHA-256: a3116de25b1e5d087ff98dd933b56b61337e9a5ac407c992b47dd49f59addb36

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