Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c20d9b45435c020…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 09:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca80d310e2b35b547f498e207316110c SHA-1: dcbe59d8d87980fc87e4866dbf0a2688c4a3d290 SHA-256: 9c20d9b45435c02008d48f5ebac973fa63bf1e119401110210ccc5315f831bc7
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they have won a prize or are due a large sum of money, requiring them to interact with the provided links. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://vilenefex.ru/aws?utm_term=oster+waffle+iron+recipes
    • http://loduwij.scienceontheweb.net/14336606142.pdf
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/wuxitojuze_dezujijolisit_sewamepiwezamir_kafejinub.pdf
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/gomerokim-wirerejavewe-vewiwewug.pdf
    • http://gatowixipeba.mywebcommunity.org/novuboxitabovati.pdf
    • http://rejemezurufoveg.mywebcommunity.org/cyber_security_courses_online.pdf
    • http://youralteragoods.com/wu_tang_clan_real_names_hulue8zna.pdf
    • http://bilet-pdd.site/how_to_reprogram_ford_instrument_clustera6ay0.pdf
    • https://lolujimibo.weebly.com/uploads/1/3/0/7/130740441/2cc70.pdf
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/123e2c26a10e2.pdf
    • http://kismykeitio.best/19157712141gwcp2.pdf
    • http://tixesikixux.mygamesonline.org/70650968531.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/goneduzum/how_to_use_macros_in_google_sheets.pdf
    • https://s3.amazonaws.com/pubopelej/ebola_virus_disease.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/jogexizipekirikotumaw.pdf
    • https://s3.amazonaws.com/mizeteb/medenofowuxo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83b.bin
b67aa92efb94ac10e14de50024ea1c86cda281668c8ea7b660321fce58244e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5128 bytes
font_01_sfnt_off0000f9d2.bin
1a9a30f49070715f563abad01cef9d6f82ce1c501dd9acd1053317cf3a78dfb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10488 bytes

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