Malicious PDF — malware analysis report

Static analysis result for SHA-256 5643d6dfc0baaaf9…

MALICIOUS

PDF

82.5 KB Created: 2021-02-15 05:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 99cac6b0abbc4a285adfda8c26825f13 SHA-1: 26fa857bf17130d9b91b63218e87c119e3b9a151 SHA-256: 5643d6dfc0baaaf9d57d02fdb51a48a9feefdcd181558e8ca175eadb657b8f60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://jacksth.ru/wb?keyword=acid%20amine%20coupling%20reagents%20pdf', indicates a lure to a specific search query. ClamAV and ML classifiers flagged this as a phishing or malicious PDF, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/wb?keyword=acid%20amine%20coupling%20reagents%20pdf PDF link annotation
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/6917368.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/01f8b83778d9c.pdfIn PDF document text
    • http://price-list.moscow/zunojebeditajeripifenoget65ewu.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/kefiperizonofu/xeninotozigaruruko.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/sevoxopazimemitafuxip.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/impedire_aggiornamenti_automatici_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/66767432413.pdfIn PDF document text
    • http://retejades.rf.gd/dotukidukovoxo.pdfIn PDF document text
    • http://tumitodutib.rf.gd/81642415769.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/tugepiruliw.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/dragon_ball_super_game_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/free_algebra_1_worksheets_and_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/wijimepinekenezixuzeruja.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/dakedotemajem.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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 5464 bytes
SHA-256: 60fce638c754710f95fef43574756fd108066d334bde9dded96b55c1216f7fc8
font_01_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 11476 bytes
SHA-256: 865c8c5daa7e03904bbb3afe13dfd4a9ec0b2465acfb194d7da7995c64906752

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