Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e98c4638432bbc…

MALICIOUS

PDF

101.3 KB Created: 2020-12-22 21:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ce2932e63606f7bc48a2e291f8130cf0 SHA-1: 16da424ad17a008485a7f845957b60a3e81a8225 SHA-256: 15e98c4638432bbc4749ffa9f24fd10cfcfb417a194d916fdaba9d2ea957ecc3
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 heuristic indicating a mass external PDF link farm, with one primary malicious URL identified. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using a social engineering lure related to clinical examination documents.

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://trafffe.ru/aws?utm_term=clinical+examination+of+cranial+nerves+pdf PDF link annotation
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/4fe0d5ea65de.pdfIn PDF document text
    • https://tisogile.weebly.com/uploads/1/3/4/7/134728595/a18e4e9.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/vibasujefir/employee_joining_letter_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/best_music_album_app_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79814100abc42af3e4ce9/t/5fd1702dad61ab58317f5b8e/1607561262348/tiny_worlds_mod_1._6._4.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ccf068612547ed7f99b1/t/5fc8c52b8eecd53e39f28a76/1606993195509/battlevoid_first_contact_mod_apk_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcaa7c5e71df64d6bdd8f6/t/5fdd0a71907d0c7fee15a47c/1608321649851/44881061000.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/98827135823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0fc731-a58d-4328-a8b4-0ab6307831ed/gojixafawirolip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d04a97599144eedb716/1606372613580/nefefofazoxiboxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/xebesolunuvolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87951308-a5cc-4da3-a7b7-482f0e8fa54b/riff_tamson_action_figure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7060d6-ca6d-4b7d-a723-aaec803473fa/gamestop_union_city_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038a4b87-ede8-4912-a551-31cab9eeb8a3/rodamidosimebenebix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b2a2e9-390b-4250-8064-a725bbfd3349/60547593050.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001463b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463B 2940 bytes
SHA-256: b1a9ff6ba35dc6afe0897100fc92f3f1f3234f8fbf85b49142f1f5db2d57e62f
font_01_sfnt_off000150c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 5336 bytes
SHA-256: a52fe91bb67a8cd1377c83a4b28b0144b1a25413f71f326679038e7c2c0a74f1
font_02_sfnt_off000162e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E2 10752 bytes
SHA-256: 4196c1fc7a71f35a9ca6e3358901822b73900917a78e03ce4538091bc6ad9d0a

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