Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f4c166f01ff2e3…

MALICIOUS

PDF

77.2 KB Created: 2021-01-19 01:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7e4bbe9c32b3e241a89336369575f0ea SHA-1: 81884dc215358380e9faafaff2c28598fac59441 SHA-256: 20f4c166f01ff2e356ebcf75005b7766516880f2c164b55d4f2936dbb4f3290f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, flagged by heuristics as a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially obfuscated, contains text related to scientific concepts, possibly to appear legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=discuss+the+relative+permeability+of+the+membrane+to+na%252B+and+k%252B+in+a+resting+neuron PDF link annotation
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/tumiba-dufewopukoweza-masozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_5fc20d5539cab.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/jemizebanumijufalesa.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/bigaweferufemox_jemoxenifawu_tevuropijatoj_vosavijaf.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/1152029.pdfIn PDF document text
    • http://xadimilok.iblogger.org/84483065584.pdfIn PDF document text
    • https://nutofuwinoxa.weebly.com/uploads/1/3/4/7/134719482/sibimesebobomaxadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5ff302c1d0d60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fbb21427e5c3.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/dagasopones/42403643888.pdfIn PDF document text
    • http://jokilezitewoj.epizy.com/16462338863.pdfIn PDF document text
    • http://vipowiso.epizy.com/zifevumemumobex.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/sixagepokazej.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/nejilojawuz.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/78134719028.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/magekebegagedeselol.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/pixels_beauty_camera_2019.pdfIn PDF document text
    • http://zusewijoje.epizy.com/91026968281.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/power_efficiency_guide_free_plans.pdfIn PDF document text
    • http://goruloloxoz.rf.gd/fekovodalumebola.pdfIn PDF document text
    • http://ziboporo.epizy.com/32004156702.pdfIn PDF document text
    • http://rupeguv.epizy.com/free_printable_farewell_card_template.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5968 bytes
SHA-256: 5e4b4351905a932d6181ab0eb384e487fca999bcb3ffe5e03432ab586c7bad44
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 10316 bytes
SHA-256: dddeb85463c3c3100cbc7d8e3d7623eeecb9303897c8b3c43205331d2bae84b0

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