Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda664f55a5018e4…

MALICIOUS

PDF

99.2 KB Created: 2021-03-20 22:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3ff46b4167cd1bc3d31d34912c78938 SHA-1: 8a68ca70a776ea5544d072b25ed989fc8518e572 SHA-256: dda664f55a5018e491737e13a3937628fd0ffa52f8db375d1c100b41bf5f58e0
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=the+proposition+katie+ashley+pdf+free+download PDF link annotation
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/jewuris.pdfIn PDF document text
    • https://gijesetezoludad.weebly.com/uploads/1/3/5/3/135348421/nojifadunatabux_davutif.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/62834801338.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/meganumog.pdfIn PDF document text
    • http://datinge.site/livros_de_culinaria_em_gratisaqi6f.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/mizogivefijibavarino.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/principles_of_microeconomics_8th_edition_cengage.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/mozaxasezaruvakozuropude.pdfIn PDF document text
    • http://homeolimp.com/430380889672tb49.pdfIn PDF document text
    • http://wersita.space/zaribalikirotudexisoduwudnt.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/lawog3qi68.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/mokonewa.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/4186781.pdfIn PDF document text
    • http://nat-fru.space/35349198709qvh48.pdfIn PDF document text
    • https://ligunoko.weebly.com/uploads/1/3/4/3/134308404/waroki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_76c5680d4b794254ad93cdd8c264f788.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_0adf803ed89b496cb364fbdc1cc30086.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_31c9398186944d53b9a031f3f53a09a3.pdf?index=trueIn PDF document text
    • http://tinyurl.com/ze3utyuIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 5124 bytes
SHA-256: 62a00f7de77fe4c6b038f2b0d6a823c3078ec736cc15c1e4ba7d60931af2c42f
font_01_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 10800 bytes
SHA-256: 36dfe77b53d95b7a801c317697b303bba9c3603518d8848e7721755149b75f45
font_02_sfnt_off00015ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA1 16248 bytes
SHA-256: 7f10b5217708b7aced76a9c7cd02a51188d2af7235ea23585d094f6560042d0f
font_03_sfnt_off000170f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e