Malicious PDF — malware analysis report

Static analysis result for SHA-256 82aebd886339cc51…

MALICIOUS

PDF

78.9 KB Created: 2020-12-30 16:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b6c207926337f28f6e04e9570fc35990 SHA-1: e94c52f69014c2f53c3c807bf2d18b46cd82546f SHA-256: 82aebd886339cc5135835abe7bb215872775f180bbf5d0b1e097c3b74bd7e271
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, indicating an attempt to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest a link farm or phishing campaign, likely aiming to distribute further malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=2sinxcosx+trig+identity PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405197/normal_5fe4aaae26c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_5fb6e992e1e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f8fd63390080.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/2af4e6c69fecc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f923b677a65b.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/4154cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fc99e9a33cf0.pdfIn PDF document text
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/fukobapovuxifomegow.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/xagawoj-xiser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wivunonovef/gemulapexuzokokam.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/68183018099.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/vofikibugitasoganiruvigo.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/math_questions_and_answers_for_grade_4.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 4860 bytes
SHA-256: f2967e93697cff58d03e597ba88c7ecc0408d6ca5d7d79a3b666e312efd4161c
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 14828 bytes
SHA-256: 3a42fdc65472478f8daee6258e2aa5a5730b5b524df48030ea31eb96c61c9cff
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e
font_03_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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