Malicious PDF — malware analysis report

Static analysis result for SHA-256 148630460befcd55…

MALICIOUS

PDF

74.7 KB Created: 2021-03-29 00:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0159bca6f178966ed43db71dacb73da0 SHA-1: 1384eabb49940c32a12ecf218f810c277b6515dd SHA-256: 148630460befcd55623fa648a1000e65042dd3b4c7d8891480cf8e1e512ee3d9
156 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ClamAV and an ML classifier, contains numerous external links, with one pointing to 'midufefew.ru'. This suggests a link farm or phishing lure, disguised as a guide for APA style referencing. The presence of external URIs and a high number of PDF links indicates a malicious intent to redirect users to potentially harmful websites.

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://midufefew.ru/strik?utm_term=how+to+reference+internet+article+apa+style PDF link annotation
    • https://bogijaxik.weebly.com/uploads/1/3/2/6/132682919/1574841.pdfIn PDF document text
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/026930aa0b2.pdfIn PDF document text
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/lagerinito-fuganadofipagem-venaxakikix-sesujedoralune.pdfIn PDF document text
    • https://doxavigefixo.weebly.com/uploads/1/3/5/3/135391607/662474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_b4ee2281a9a047b9b5adecbeb79071c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/afunika_moment_of_time_free.pdfIn PDF document text
    • http://sukuvafeliji.epizy.com/oriflame_beauty_application.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/faxitowe.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_4b86de7b74e3436a95675e1274b1ba3e.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_145c5bb8c2cf4e33b6876ca3e33cdfce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/38135587093.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_abe259ab39254178848c9fa5b7d1499e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/medodubawexoluwelusob.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_99fa454af9f542a8a3ffc091d2c9720f.pdf?index=trueIn PDF document text
    • http://zikefibuji.rf.gd/job_advertisement_in_newspaper.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/shwebook_dictionary_free_for_android.pdfIn PDF document text
    • http://giwoxut.rf.gd/arriscando_a_prpria_pele_assimetrias_ocultas_no_cotidiano_download.pdfIn PDF document text
    • http://vemewef.rf.gd/rovizakixotas.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_84c7421f7a314144a5153fe520c74907.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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 5164 bytes
SHA-256: 5d549ef8694f3cdb7abbd92b87d0a47d9e995194929a32bb815b7e524df56042
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 11408 bytes
SHA-256: 501ea6b6c2ce55f4d84184b5e98221382d85278f58c0e484b6ab05b2b8b197a8

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