Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4add34d8bfd3140…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 11:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c0b90541bf36dd5f5bb856a40b6e2a4b SHA-1: 72fca5413687419c24ee65e8a2897f881a67787e SHA-256: f4add34d8bfd3140ecf1b37e462425685949dea471dd52e6c04aac6ca5ad63c3
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 0.9996

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://crophysi.ru/123?utm_term=cloudformation+template+ec2+with+ebs PDF link annotation
    • http://natnat.fun/is_pastafarianism_a_recognized_religion_in_the_uksrjrz.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/1902913.pdfIn PDF document text
    • http://godumos.22web.org/16986944846.pdfIn PDF document text
    • https://xinogibujijinak.weebly.com/uploads/1/3/4/2/134235465/jefidepazusixel_xojopiv.pdfIn PDF document text
    • http://damezevuba.iblogger.org/arihant_banking_awareness_books.pdfIn PDF document text
    • http://bigmagazin.xyz/bijopowitunezogojosobopct.pdfIn PDF document text
    • https://kunidaput.weebly.com/uploads/1/3/4/7/134766790/mozubovekutepux.pdfIn PDF document text
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/pareri.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/technical_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_9e853110a6fa4127b282d9ebdb676934.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_dd82d6f0acbb4a72828934519ca77f4a.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/30250634182.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_d05ffd98847b4d3b8b17221827ea72de.pdf?index=trueIn PDF document text
    • http://ganifexot.epizy.com/differential_calculus_krishna_series_download.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_339ca4dd8e784815800a11e2fefd7df0.pdf?index=trueIn PDF document text
    • http://gegokuberil.rf.gd/after_2_indir_yandex.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_936439097c2b4f6496fb2d7f72ccfc2f.pdf?index=trueIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_dc7d52b80fff48d6853c41c00eae7a54.pdf?index=trueIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/international_journal_of_public_administration_scimago.pdfIn PDF document text
    • http://kukalofawofami.epizy.com/how_to_iso_9001_certification.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_eb4e9d653819408b8b6ad11639c1a285.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_d6d7ff0b39264147a28032ba8f296306.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5664 bytes
SHA-256: 812c82332b6d035156ec202687f04112717efcd920b2323a4380a5a5826566b4
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 10896 bytes
SHA-256: eb71ce6afb214c2fecf9b9251e30d24580e15f06c2d2b98c7d0fa4961981aa6a