Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b14cc33e8acd3f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 13:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1304cb242ee21e9f0fe24b924ff79ae8 SHA-1: 5e5983d13adb6816da45804adfc92e1446522eae SHA-256: c1b14cc33e8acd3f6ccd94acf39be0ccb6c1cd7ddfcdd03382fd4d67ef545788
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The embedded URL points to a domain that is likely malicious and associated with the phishing attempt. The document body, though heavily obfuscated, contains text related to an air conditioner review, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=danby+air+conditioner+12000+btu+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423136/normal_6030d8cb8cee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5ffc86f9d9f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_603213de336bf.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/hidibr8/sapiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd9722895d54.pdfIn PDF document text
    • https://xutobegepoxebax.weebly.com/uploads/1/3/5/3/135333125/722558.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/Dijfhh8/14370864567.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/eigi1hb/polejemibufopud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negavutagogo.epizy.com/46888179622.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/angularjs_form_validation_on_submit_jsfiddle.pdfIn PDF document text
    • http://kiburomuwilun.epizy.com/78871685941.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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 5440 bytes
SHA-256: 1fd4c9338caba2a4e854d8663d69b6feabcaf68a9b057dfd6d7d51a412c00f3c
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 10956 bytes
SHA-256: e45757ecbbf1e3868b40348bb0da8eedae5c212c513589b6bda5e103e7787cac

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