Malicious PDF — malware analysis report

Static analysis result for SHA-256 7153b8c5682ca582…

MALICIOUS

PDF

76.9 KB Created: 2021-02-09 23:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a6334653934b2261090908cfe8c7bdd8 SHA-1: fa2894131edec245abc105e941e8b5107722629e SHA-256: 7153b8c5682ca582dcdc1b8e9726f768c80113f9c6c7b1d857e85066b7184963
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 are hosted on disposable domains or file-sharing services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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://jacksth.ru/aws?utm_term=bugzilla+tool+tutorial+pdf PDF link annotation
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/f32b692ccfa.pdfIn PDF document text
    • http://boost-store.net/minwax_wood_filler_color_chart647vv.pdfIn PDF document text
    • http://baugroup.info/tedelakyd7z4.pdfIn PDF document text
    • http://fortuneo.best/esp32_web_server_with_arduino_ideb7cs3.pdfIn PDF document text
    • http://ericksandoval.com/304738397422j98r.pdfIn PDF document text
    • http://eu-study.ru/wyze_app_androidl91ta.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/fepovimexus-rusotemub-xivipaxidinusor-dofivuborudiki.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/mavaxilatisonupafawa.pdfIn PDF document text
    • http://polnews.xyz/gmail_ar_yahoo_pat_kuris_yra15zrh.pdfIn PDF document text
    • http://e-devletodeme.net/totagajippa1tk.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/50960.pdfIn PDF document text
    • https://gurugurib.weebly.com/uploads/1/3/1/3/131384113/8811307.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/bubodeliza/12346524788.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/aruna_sairam_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/acdsee_pro_8_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/96424500714.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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 5132 bytes
SHA-256: 14fa3231e6456ddaa972c551c35d5b1f776458555df93cb4b5b362ad6d591a9f
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 11112 bytes
SHA-256: c3b2ed530d4b00b10d6304786372dd7b16b7d4aa6b8f3769103512efaf39eb95

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