Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b4b62b77b3c74…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 03:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2bcb1936ba852f63724f15f31121c965 SHA-1: 0e6647a6aa78261ca954a1391987cfd75015c61d SHA-256: 308b4b62b77b3c745fe64b1988964de81cb131e9552dde3ac821dba4daffcf85
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links pointing to a single domain, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=best+nicholas+sparks+books+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499002/normal_60356f456bb54.pdfIn PDF document text
    • http://experiment.website/trials_of_apollo_the_dark_prophecy_mknmw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_6037b98c9c8f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447912/normal_5ff98b8d6eef9.pdfIn PDF document text
    • http://milesnires.xyz/dna_structure_and_replication_quiz_answersm2fz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6021ebd6706eb.pdfIn PDF document text
    • http://circulyarkadigital.xyz/juziwamaregararaneun9kh.pdfIn PDF document text
    • http://ogranicbio.fun/fojaputavikuzitupiqxzna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5fee660552214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_602e2c14d2b10.pdfIn PDF document text
    • https://cdn.sqhk.co/wubumeze/SiczVHV/63499992225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_60159360b54d5.pdfIn PDF document text
    • https://cdn.sqhk.co/gizafimode/y2gcD5k/man_or_vampire_stats_guide.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/b7a733b0-1ec0-4ddc-a806-575abc852846/gekipoxulovexiperufepulu.pdfIn PDF document text
    • http://meguwuzib.rf.gd/simple_harmonic_motion_worksheet_answer_key.pdfIn PDF document text
    • http://titaleze.rf.gd/gejedenemunifabiniwomiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db39e903-0d9d-4e8e-8632-db0aecf87680/how_to_influence_others_and_make_friends.pdfIn PDF document text
    • http://vagonaziluro.epizy.com/tomeborokunaforefobefe.pdfIn PDF document text
    • http://jurepofopu.rf.gd/window_air_conditioner_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f801b35b-d722-41ce-a421-bfac22213767/zigivazo.pdfIn PDF document text
    • http://vibibidazez.epizy.com/14548349227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb01f3fe-6590-43ef-8886-c25c8f19e420/vakulebur.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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 5756 bytes
SHA-256: 6fce5ade588f266c53e8d24d21b88eb652bca2c0868258f8d2f4accfcaf79a44
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 11316 bytes
SHA-256: d329dc4d4d2daed922cc127aa0a9dee766a1a47e3efb1b681b053210c5598b57

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