Malicious PDF — malware analysis report

Static analysis result for SHA-256 4656a9cbd239f116…

MALICIOUS

PDF

72.6 KB Created: 2020-11-24 22:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 53d46f74efe3136f369d4e288eeb267e SHA-1: 9ca22b8b28ebce21abcc24f32abe9509b541ee4d SHA-256: 4656a9cbd239f116f59ef69773da948ce3269e3c8e474686f156d5e0ff7caf45
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=du+speed+booster+apk+for+android In PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/sotamumoz_jonurulotomif_xabonutaxelu.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/1395216.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/7539276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446378/normal_5fb42972207ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f9ee4bfb2928.pdfIn PDF document text
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/7645764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5fb5de886bc85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f941907be128.pdfIn PDF document text
    • https://poxedavuk.weebly.com/uploads/1/3/4/6/134608045/4417071.pdfIn PDF document text
    • https://xejepelurafuxiv.weebly.com/uploads/1/3/4/8/134887300/9838290.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/xipavir/lonely_planet_japan_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/mereb.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/hidrocarburos_alcanos.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/njrotc_area_5_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/paxeniwez.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/amaravati_anantapur_expressway_route_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 5208 bytes
SHA-256: ebe7af2641d2847caa1c789b3a932faa7b7b8ca1a69fecb0b2af12f0c3ab1f1d
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 2252 bytes
SHA-256: 3f019984cfdfe6c84274c7669782eb41d5b5f4473003a8ae79e5f286dfbd04e2
font_02_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 11908 bytes
SHA-256: bb7ea50d5384bfead2cb0c19ffcb26bd51f3300ecc6959cf6dd250e53184c76a

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