Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d12f20e6628a61c…

MALICIOUS

PDF

84.6 KB Created: 2021-01-11 09:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba3181f4d5c7694476993499d6c157b6 SHA-1: 4a71e653ebcfb8fe61602d61991f53a3f53e48ba SHA-256: 8d12f20e6628a61cb4a596f288284304a5a76eb382639be76a22fe190dee5134
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary malicious URL identified is traffset.ru, which is likely used to redirect users to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • 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://traffset.ru/aws?utm_term=browser+mozilla+firefox+android PDF link annotation
    • https://site-1168239.mozfiles.com/files/1168239/71748887101.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/vooks_free_for_parents.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/vavimakifozidix_xirokap.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/9651730.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/gudepumivumofemab.pdfIn PDF document text
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/b8d4d345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fef9b491744d.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/ladiwuzetawedi/apache_poi_4._1._0.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/microsoft_outlook_out_of_office_reply_template.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/pocket_juice_2000mah_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/padamojuguwukakilibemuge.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/vesefemigevuvuresilipani.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/diabetes_canada_guidelines_gestational_diabetes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 5312 bytes
SHA-256: 9e43703bf87bfdebfca9da6a3e792f8bfe64d10dd39da6699a19598c23abe6c2
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 10968 bytes
SHA-256: 56c761062b649d2065406d23d07806e27c8857296386cfaa2a078b5891b8dfa8
font_02_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 16088 bytes
SHA-256: fff8b70d67420864e2a263fdbbaad35efae781e73a516d3cf38207748e8715b5

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