Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bc2cb1c5d68a32…

MALICIOUS

PDF

67.3 KB Created: 2020-12-18 18:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0115c2f0172fb35bd6ca8353ed4a0904 SHA-1: 1b5d82f1ed3e8926abec1535ca0fa1fca0580bb1 SHA-256: b5bc2cb1c5d68a32683825d1e6183ad3e5e89ff34ce57cc01b857af664954708
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://traffset.ru/strik?utm_term=midsouth+philosophy+conference PDF link annotation
    • https://zitilegog.weebly.com/uploads/1/3/4/5/134501444/2461b26f01cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f895c967dd96.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wazotikateletuwuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8a3deb43b93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0b38aa-d46a-413e-9b13-c5e8be1f8d08/84747288424.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/famous_artists_word_whizzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/dixenuzexobope.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/jenizuxobuwonagutilog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e69a67-f2ea-4ab1-ba7c-b2804646f9ab/dolalexebekil.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/official_sat_study_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c31c29-1b2e-4239-bdbb-b9b04be47305/ending_of_movie_of_mice_and_men.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc594e3084698658e7e1dcb/t/5fc75bd71d106d256bc1a633/1606900696106/dinosaur_simulator_city_destroyer_megavore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0444382-16e6-4f2e-a557-a88ae877024a/hotspot_shield_elite_apk_full_cracke.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/13351248866.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf19ecb3e0f577113bb66/1606283684635/38337814043.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_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 5140 bytes
SHA-256: 2b4447de5e9d481f1db27bbc9b36f7a9fd4cdae85915f11a5bfc443f866c0cd6
font_01_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 11032 bytes
SHA-256: cc422b3987cc232a0beffb287e280d4589858756054580557da275367ac37eaf

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