Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a691df8d2c0f9c…

MALICIOUS

PDF

83.1 KB Created: 2021-02-27 11:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1b676378d24a7d0dc017bd6b21b8d1fd SHA-1: 3e9e174cc281b397ec30d4489c2102abb0dca6a5 SHA-256: b4a691df8d2c0f9c35a241bc4b48788cefcec1a42d83d5873c32746ebc4fcb63
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/aws?utm_term=just+2+words+level+148 PDF link annotation
    • http://tezibif.mygamesonline.org/biblia_de_estudio_vida_plena_gratis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5ff275ecaf30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_6032f87dd8354.pdfIn PDF document text
    • https://sonatovixafu.weebly.com/uploads/1/3/1/8/131871956/7527953.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/zarefukuxus.pdfIn PDF document text
    • http://todayit.pro/3d_logo_mockup_psd_template_freeevj5p.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/1baf16f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5fcb65cfc4ed7.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/juferunesotenupal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5fdcc1fe4afb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe41ffecd941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_600fe57e519cf.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/what_are_the_best_cordless_phones_for_hearing_impaired.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/xososuga.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/wejanupenupig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://noratev.myartsonline.com/how_to_test_a_landscape_lighting_transformer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 4944 bytes
SHA-256: a324f6c59af24cf552bfbbfdec5ef2ddc646faeb9cbe71ed74a9d4e23ed98b61
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 11140 bytes
SHA-256: df726e752c6c01bbfdbcd1902d3effa7a592027075b55cc710daea92fe00d373
font_02_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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