Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21291826a3a037e…

MALICIOUS

PDF

63.6 KB Created: 2021-02-10 22:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a659a44552513531f775409be6cffbb SHA-1: 4c28763886ac26b4941d8c28d05cba1698bf17d1 SHA-256: f21291826a3a037efa40d0aa5617ea39e749bd619f4e92ca90cc3f71e80f866e
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a payload or visiting a phishing site. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit the user through a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wb?keyword=nomenclatura%20quimica%20inorganica%20pdf PDF link annotation
    • http://lajibodomemebev.66ghz.com/12742639976.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/hjheDgd/hexbug_catapult_launcher.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/tiipV37/talking_tom_candy_run_achievements.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/ghngflj/bobanimixanatoji.pdfIn PDF document text
    • http://saratov.ooo/dental_assistant_salary_2019_nyc1hvns.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/cijGVhd/amc_mud_calc.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/gumegulaxi/70731571134.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/pidazazunef.pdfIn PDF document text
    • http://rilifufamorupud.epizy.com/genir.pdfIn PDF document text
    • http://topasirerawo.rf.gd/adapt_sound_apk.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/cambridge_english_empower_a1.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/xatekevo.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/25601912182.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/fitbit_alta_hr_uk_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/6865406044.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_off0000ba23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA23 5392 bytes
SHA-256: f50e504a4cffccadca7a8986b171a4220b416548bfe8fbe61eed4775a20f0060
font_01_sfnt_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 10996 bytes
SHA-256: a7416ab6b7e7014ec0a643b7c8eed161ad9786b28784b943b06e77f692cac898

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