Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d73d81a8c4271d9…

MALICIOUS

PDF

86.6 KB Created: 2021-02-26 21:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ede451599f00fbbc25df32fe203ff4a SHA-1: 197c1dee3684c1995d7fee572c776ad2676d5108 SHA-256: 6d73d81a8c4271d91bbf71dc05ccfe93716978ec1ec9049772ad1da345f800f5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL suggests a lure for downloading chemistry-related documents, which could be a pretext for delivering a malicious payload.

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://xajibur.ru/wb?keyword=name%20reactions%20in%20organic%20chemistry%20with%20mechanism%20pdf%20download PDF link annotation
    • http://pokujedamoku.22web.org/el_profeta_khalil_gibran_pelicula_online_espaol_latino.pdfIn PDF document text
    • https://xowemaxixedire.weebly.com/uploads/1/3/5/3/135325030/3cc50263f5334b.pdfIn PDF document text
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/1215527.pdfIn PDF document text
    • https://xivibivo.weebly.com/uploads/1/3/4/3/134353446/487290.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/ejhZgjW/nitewu.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/24348965307.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/zutupatikimogekon.pdfIn PDF document text
    • https://lapaterema.weebly.com/uploads/1/3/5/3/135321282/95de2e0c33a871.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/2269738.pdfIn PDF document text
    • http://gaxixumerimu.iblogger.org/filmywap_2019_movie_bollywood.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/wujafivabipo/24806483940.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/cruciform_ligament_cervical_spine.pdfIn PDF document text
    • http://rozizibuno.epizy.com/adaraya_agamaki_official_video_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/vuvuxowoto.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/tajunepanirixodafenoteja.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/karma_guide_ap.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/sadogajusunajumuwasuse.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_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 5732 bytes
SHA-256: 4743d482df89f8607c8e02420f3b3edff5b12de213ff3b45cbe7cc428ff18350
font_01_sfnt_off00012789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 10768 bytes
SHA-256: 94ae20a3a1d58585492bea71725808a59f88ef49008f91ccf94ddd53c334b8d2

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