Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ccd61671b86098…

MALICIOUS

PDF

76.7 KB Created: 2021-05-29 16:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e01040a7c38921d1ffd906eddfa2b1b SHA-1: c87c8a79b2a91b6f4e6d03c11a3c2b7e93778f5b SHA-256: f1ccd61671b860986f7f7f2247a152ff6e99c4c592c2bd0ee7e6b90781ac0c26
156 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. 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
  • 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://maypoin.ru/strik?utm_term=actividades+para+ni%25C3%25B1os+de+primer+grado+lenguaje PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371814/normal_5fc85dcb9ff07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_60290b2322f2d.pdfIn PDF document text
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/pezufesuje-nisatilalegosa-baxum.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4425483/normal_60b1e971d35f5.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/5393378.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/zoxov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5ff8ee8188e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_606c40953a1c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459926/normal_602b3aed889df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ff71b911d13d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_5ff04bce2dc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_60414d4b6f958.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/144d234c-fd4e-42d5-83e1-fed4abffc031/zisekeweku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1717b38-4c47-492e-8fbd-8755ba74f574/51972819928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af71eb6-28da-4357-bdb4-68175ccbd8b6/how_to_trade_stock_in_pre_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fc3c76-cf6e-4315-a38e-3cb0c2316508/2006_american_buffalo_1_oz._gold_proof_coin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6d4c87-b317-4c59-8cea-f2edfd09df21/pifabimiruwujigira.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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 5732 bytes
SHA-256: 45bf023fbb6f61e612ba7c6323e224e6135d93f92c95669d22af06c8a351018a
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 12920 bytes
SHA-256: 5a5d326b717cb81bb3ecc9382fce3df6b7bea4c49a149b980ad4921655f40d2f

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