Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5987fbb7a553443…

MALICIOUS

PDF

84.8 KB Created: 2021-03-27 16:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bc90ca2a78a08a026fef934c3eabcb38 SHA-1: 376bc5167eb0b82ab7f9943b25451134dc20f60c SHA-256: f5987fbb7a553443071d3ecdec8d652f6aa027f3076ae5a5585181792b5e056b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://lozipotod.ru/award?keyword=all+computer+course+pdf+download PDF link annotation
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/sebuf_vavuwipilurot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_5fe996f5dca6b.pdfIn PDF document text
    • https://vakupakofusiwu.weebly.com/uploads/1/3/5/3/135399484/bed7ac.pdfIn PDF document text
    • https://xezazevexu.weebly.com/uploads/1/3/5/9/135990031/3952354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_6056a3e959e05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_7cd8b87a5ebc4834992e97a52544f28e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/sinners_in_the_hand_of_an_angry_god_imagery.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/interview_questions_and_answers_for_selenium.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/baillie_gifford_co_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/salvation_army_donation_guide_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/brain_training_for_dogs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/arizona_beneficiary_deed_forms.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_340b9cbd294b484780991ea588fa272f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lepefi/twilight_saga_breaking_dawn_free_download_in_hindi.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_4f5c0da982fa4322b35c576454700939.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/jadosikigije.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_fb4a88ef995041cda51bb87b32b81a88.pdf?index=trueIn 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_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 5384 bytes
SHA-256: 74b111a14efc13cf4e88d454925792c232d8e84a7968d7735334a1696ba01f82
font_01_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 11228 bytes
SHA-256: 18bb350fea27c773116e64cfe94659e76391a021135af6da4847a16d567ddbb6

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