Malicious PDF — malware analysis report

Static analysis result for SHA-256 5587385721ea9180…

MALICIOUS

PDF

93.0 KB Created: 2021-03-24 03:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ac1f1b0b7babf6793caa9b15d7f76b5 SHA-1: 22d52c2f24f9522b9d1f68fb112722444010bf61 SHA-256: 5587385721ea918033b7c46648f9be9ff68c8b761dd25359147001fe640aadb2
186 Risk Score

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 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=gender+roles+in+igbo+culture PDF link annotation
    • http://zenajok.medianewsonline.com/broadcasting_services_act_1992_australia.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/beats_solo_3_wireless_bluetooth_headphones_-_black_review.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/semiconductor_optical_amplifiers_connelly.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/16479435.pdfIn PDF document text
    • http://gemajesubon.22web.org/coordinate_geometry_class_10_important_questions.pdfIn PDF document text
    • http://fadovemani.iblogger.org/32812196007.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
    • http://wutejaxevewef.myartsonline.com/vitepa.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/vokupopiriwa.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_3ec2197ae452429cb73d473a5aeaa525.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_52af834bc145418a81102680348d08ea.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_49d64585b87f438793047242dab27cad.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_5446060c127544d2a0b40bf3bfddd687.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_321f353d9c3f47d39a8d82e4a45c5097.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_1976f8d7f77d46dbbe4ee881aed514e0.pdf?index=trueIn PDF document text
    • http://tuzuxutetug.atwebpages.com/body_language_book_fbi.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_54736a271500401590ed2833faf89433.pdf?index=trueIn PDF document text
    • http://watusatuvor.myartsonline.com/apache_airflow_tutorial.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_2b8a15cd617b4fcdbcd8cd7284d972ca.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_97769d9636714eb3b129a404c258a80e.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_a02adbed4d194a9fa2415fbeb81a653f.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_e7fbec5b1267495b930316c679415818.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_ce2a2ea38df946db8f88389a43d575b0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 4952 bytes
SHA-256: 2edc0683be7e46a819df1a12e2a6bdc38f6ef42b275c11b6af5f3882f6f36fc9
font_01_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 11712 bytes
SHA-256: 3e0a890dff9902365d25bd6e20d96370760fcee1653f1794854e37664776171c
font_02_sfnt_off00015857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15857 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230