Malicious PDF — malware analysis report

Static analysis result for SHA-256 43071aac196d6da2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 22:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 18359ac3f21a607fe81da702142b336f SHA-1: 3ca95a119ad4b6816c80c5df449d687b2211ec0a SHA-256: 43071aac196d6da2ed175413d9115ba5c0ca2c17f6d61c49b2d93e6116b676ac
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 are part of a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=signs+and+symptoms+of+early+pregnancy+pdf PDF link annotation
    • https://kenafidoragakox.weebly.com/uploads/1/3/1/8/131856022/9844720.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/dMjbhdm/dovelatetudun.pdfIn PDF document text
    • https://wupexuzirat.weebly.com/uploads/1/3/5/3/135338028/dofipadedomexadaki.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/8341232037.pdfIn PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/nakenusamagu-zepuvifagapanip-gudoriwefugot-mefuve.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/5955231334.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/jRGtu24/2799602502.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/9521664.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/geI6hdS/93904235854.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/5765643950.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/eb5b2738-c2b1-4868-b501-978a17b9e353/69334929689.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/curriculum_vitae_francais_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/66728931606.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/39168098742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a08ab80-0a7d-4dec-8240-24f904fdb6ba/pubefogitoxosixedisaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88200a4-9a49-49d9-a5fd-eab023d8be0b/how_to_update_table_of_contents_in_word_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/fire_and_evacuation_plan_template_queensland.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/kularewanomomaburo.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/wixurukezaju.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/how_to_write_a_summary_qualification_on_resume.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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 5680 bytes
SHA-256: 637cce3f27a6df2d8158384b5b53ebd7ab52ee5c7d6423a2acf76e741a0a3170
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 11348 bytes
SHA-256: 5b6e43e9a95f2f5a57726587e6f6c24d35d8de3551f953deb86a9265822fa541

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