Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44840d78b4f2a5d…

MALICIOUS

PDF

76.9 KB Created: 2021-02-19 03:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f3a5b8f5b870ea74f2a64eb3a626adff SHA-1: fe2299982d4d87480aefb5c086ed4cd330d2218a SHA-256: f44840d78b4f2a5d1ae7d4f1fdad3d3ff62bca9d267c9cbf14e4a757067bd402
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/strik?utm_term=hands+on+machine+learning+with+scikit-learn+and+tensorflow+errata PDF link annotation
    • http://shtangye.xyz/pivupaxujinl10.pdfIn PDF document text
    • http://alcozerox.com/mijopowatatabalarcehw.pdfIn PDF document text
    • http://cocobuka3.xyz/cut_the_cake_ball_gamen8o5j.pdfIn PDF document text
    • http://ig-socialmedia.xyz/budget_de_trsorerie_exercices_corrio4rcf.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/sodet_zaligalodugen_tonilomurefom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5fea0ec782c1b.pdfIn PDF document text
    • http://getcreditcheck.info/hematology_report_analysisabdm8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_6027d682a014f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5fe2787425e9d.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/psicofarmacologia_victor_uriarte_desjv7eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_600aa9cb019d1.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/ebbaaa6564.pdfIn PDF document text
    • http://shoop-fg.ru/73382605795upzyl.pdfIn PDF document text
    • http://furniture21.online/suzuki_s_cross_2020_owners_manual1wdxd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_600e9b9708563.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/47c4af11bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_601e406678864.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/xrumer_tutorialwgbku.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/zidosozawok/wuzepeku.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/cognitive_advantages_of_bilingualism.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/ripadi.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_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 5584 bytes
SHA-256: 47715967521ffbb489a73a123ec6b3aba162a1cf3f2de6afc5e6db242beae9ef
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 11296 bytes
SHA-256: f1d59ca0f15bbc9ddaaa7b261912c3cbea8f6d83452fcfdc036461c2b7351c51

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