Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcbd5b18f0c8931…

MALICIOUS

PDF

90.6 KB Created: 2021-02-23 06:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 89ea01b474e596e6e99fb4bc86d05654 SHA-1: 4afdcb7f2a5fed7806965c9e8b34bbd459a47582 SHA-256: 8fcbd5b18f0c8931be552148d4b0db9064914d8b56fb43c20c79f8909d026a34
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm designed to improve search engine ranking for specific keywords. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the structure of the PDF suggest it is part of a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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=molecular+cloning+a+laboratory+manual+4th+edition+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463807/normal_6010f6f6eee2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_601d399d7de00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fe0bc8d9a23b.pdfIn PDF document text
    • http://tasefuvakol.22web.org/fepibolofujezulozo.pdfIn PDF document text
    • http://deduvatogujax.iblogger.org/independent_and_dependent_events_worksheet_answers.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/4527268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5feeec7e6bb2c.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/togal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fe058c257a8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_60005d3ae109a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409256/normal_5fff39ef33db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_602e83e5b1c40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_6001cf59527b6.pdfIn PDF document text
    • http://fovijivil.iblogger.org/48618530080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5fcd66b52c87a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fdea3284f77e.pdfIn PDF document text
    • https://rupuleda.weebly.com/uploads/1/3/6/0/136002844/8814801.pdfIn PDF document text
    • https://zurudepovog.weebly.com/uploads/1/3/1/4/131438860/d6cf09ca31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajuloverebob.epizy.com/60603199559.pdfIn PDF document text
    • http://loxazugexola.epizy.com/blue_cross_blue_shield_federal_forms.pdfIn PDF document text
    • http://bikumekomem.epizy.com/carboxylic_acid_derivatives_reactions.pdfIn PDF document text
    • http://vekabibazegak.rf.gd/6183410809.pdfIn PDF document text
    • http://fokibuzevurir.rf.gd/types_of_gears.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_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 5820 bytes
SHA-256: a4554fb3f008b41f3ce4f71718e09c97626aa6695b327d5cdbc0b1c21c86d66e
font_01_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 10720 bytes
SHA-256: fb963b6d38d2ce905efd41ff729a1277ef1d78942778d78619001b0361c72beb

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