Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f640a59bbd5c3c…

MALICIOUS

PDF

74.4 KB Created: 2021-02-27 14:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a0b7b9e069f18b22bafd65585a05a71 SHA-1: 4e338133acd2dab710eff335a8ad13d7a4c6c551 SHA-256: c1f640a59bbd5c3ceff06e8b2ec8c1dc57a4a7f675c02c2c98c5bc1992fb126e
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it contains an external URI and a callback phishing lure, suggesting it aims to trick the user into calling a phone number. While no scripts were extracted, the presence of an external URL points to a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/wix?keyword=dremel+7300-pt+4.8v+cordless PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379610/normal_600ff770108bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_6004cb9347a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fee520198d25.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/ajjidgg/melafoxagakexasaxusevo.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/c2ygigd/3772803262.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/oijNgic/58857987567.pdfIn PDF document text
    • https://cdn.sqhk.co/powedaguja/A6igen5/top_ringtones_2019_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5ff1452badbed.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ib8lbig/drum_beats_metronome_app.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/wizuluworafid/13238463168.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/kanixemuwojuwejeri.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/32210165600.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/tagofilikoxetovo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/puxibaxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/kirizitek.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/rujobugobafifobejoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/dijurexanepi.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/zogadutifozupasevopotego.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/a._i._i._m._s_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/report_dangerous_driver_online_uk.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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 5800 bytes
SHA-256: 8a4d87d60c54f96529eb425a4930fd13e58f954416b3cff0b745d19bbf350d01
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10620 bytes
SHA-256: ab0efe867964210147ad223d2d6f9169e20b0a971562a8ef749ffe96b766caa9

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