Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98543f8496afe63…

MALICIOUS

PDF

75.9 KB Created: 2021-06-07 03:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 493fcf304ea53a5b576863243a257ae2 SHA-1: 13b4891f1215cceef8460c94a2f7ffdce88228eb SHA-256: b98543f8496afe63db3c50b9ba3e8d50d8b64119cb3d84311b0e78fc451ae4d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic to direct users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/pbw?utm_term=what+happened+with+the+diane+schuler+case PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383924/normal_604a017c44bdc.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/b7d33a1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4418368/normal_60b6a222c2157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5fd136dbc53aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_605c00064b857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_605a4e2f49874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6060052df119f.pdfIn PDF document text
    • https://pimusaxasoj.weebly.com/uploads/1/3/1/8/131856122/jusowenap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_601cbe6d0513f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_6021091826c58.pdfIn PDF document text
    • https://zejanedigerexig.weebly.com/uploads/1/3/4/7/134757062/pakewaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/trane_heat_pump_owners_manual.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/always_kabhi_kabhi_full_movie_hd_1080p_download.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144450411/modle_lettre_de_motivation_enseignement_suprieur.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/how_to_connect_subwoofer_to_speaker_wire.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/48678968844.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/june_malayalam_movie_english_subtitles.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144563958/78740126274.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144412254/40764052749.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/59537421300.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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5264 bytes
SHA-256: c8a3301971a1858ce8e95cb413d7f80400dc26fce1bf4a47a5faf2a46e29b2df
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 10612 bytes
SHA-256: 14573fbad24413b07349dd96a7d8e2a83d22f61cdfaf07caa44e2465a8b2bfce

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