Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c77c5d27937ee5…

MALICIOUS

PDF

137.1 KB Created: 2021-02-09 07:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1435fe084d707a746ad0b654232c663a SHA-1: 513456032cfe452ad06eba0e06003a61010154d7 SHA-256: 13c77c5d27937ee588f207b043d4ccbfd107cf707ab4b7a2017eb358c72391dd
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/aws?utm_term=sclerotia+galindoi+trip+report PDF link annotation
    • https://rukagevilatixa.weebly.com/uploads/1/3/1/6/131608017/jiguzix.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/gOvnaVe/45277379804.pdfIn PDF document text
    • http://fruitnaturs.space/fixadudawozokofipedolulutf7.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/eiahbcu/age_of_empires_ii_hd_build_order.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/haihn4s/sitibevigoxuv.pdfIn PDF document text
    • http://bbflowers.net/tariruzavoiojt4.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/9047828.pdfIn PDF document text
    • http://kompledom.com/asvab_for_dummies_20186soik.pdfIn PDF document text
    • http://magicwoolshop.com/110140874517a3p2.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/e3qjaCk/73458802374.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/donukadizolin/ridizumofugekukalezobitef.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/emergency_contraception_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/chloroform_co_to_znaczy.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/lukujesozovifolizuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/global_biodiversity_hotspots.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/backpacking_through_thailand_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/todalu.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/sales_quarterly_business_review_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAE8 5164 bytes
SHA-256: f8f40bfbbd64683d1fb829d64c354e5309974b1b0f698d2105a8dfe8875d67e9
font_01_sfnt_off0001ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC85 13288 bytes
SHA-256: 3c73ec7955f2793b9841586dca5677aaa0bb2f8cde34932c95fa128386368ad4

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