Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cb660714314422…

MALICIOUS

PDF

73.4 KB Created: 2021-03-20 20:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 53950da82de364af5bd0df0364a14a80 SHA-1: 522c331ed835d433cf4ab7fa6199554145420e01 SHA-256: 80cb660714314422163267ded352b3c37c8e11a950393d4e1b37d64d8974c8a4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mezovuduw.ru/123?utm_term=opera+gx+gaming+browser PDF link annotation
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/8935313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408482/normal_60036cf5e0f70.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/dobenogejusexofad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6041c1df38f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6010900f1dd51.pdfIn PDF document text
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/e2d8bd6aa7dc4.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/futupif.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/lorerexeg/92528624897.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/gopomegijijus.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/53556313962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5f6e17-f770-4936-91d4-9efbc85c4934/2010_camaro_2ss_horsepower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c988adb-d73e-4acd-85f6-d7fad6bcdeea/6447343390.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/how_does_gdp_affect_the_standard_of_living_in_turkey.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/18947463270.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/malayalam_literature_quiz_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/19043723344.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/76095847788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b4323f-3e40-4715-9de1-2588b0c2769a/13205994842.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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 5432 bytes
SHA-256: 41e950362bd2b50a1f2e43ec08c7cb8039f17ee46d32217cbcc6f0d69e3e8033
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 11204 bytes
SHA-256: fc40f76ec2ca0b7f25d7ba534e75f82820754f8bb4df8d8621fdaebe53923c97

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