Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5bcf6c0d3ea1c…

MALICIOUS

PDF

69.0 KB Created: 2020-12-22 08:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9df43913693780cdbc33ec8eefde3d82 SHA-1: ecae1f2484356b45f92a7793e8dc486934dc36ab SHA-256: 20d5bcf6c0d3ea1c0b3e3765a319a2524c326e88d75df801d8ff2686f483806b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF documents, suggesting a link farm or phishing lure. One of the extracted URLs, 'https://traffnew.ru/123?utm_term=1+lb+to+gal', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it's likely a phishing or trojan delivery mechanism.

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://traffnew.ru/123?utm_term=1+lb+to+gal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe12c3df3910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381347/normal_5fc4f959c202b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_5fb6bbbd127c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f87190b71a2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fb5b958d55d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fbd399ba073a.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/zegeluludamitove.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/wedoxu_segipijitij_vubisejefezedud_zuxadarok.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://s3.amazonaws.com/felasorarabipis/differential_and_density_gradient_centrifugation.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/zica_financial_reporting_past_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c018a3e6-17b9-49a1-8e9a-61d570ae6173/comprehensive_high_school_english_grammar_and_composition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2accc658-68c1-4481-9fda-9671cc2f3888/nts_-_national_technical_systems_zoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a2aae4-9cf9-4a5b-97e1-98df1a0c29d1/65874546256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d90d001-51d4-4def-b829-56433a904d0b/telecaster_deluxe_body_template.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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 4192 bytes
SHA-256: 70a35d8575c8c41d23dd3f6cde59b130a536c720f2b1460409a6557790167328
font_01_sfnt_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 14520 bytes
SHA-256: ed039ab07829cd3f78ecbe2b889430c68629b37f3001a8e52e33b59ac65ed416
font_02_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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