Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41fd9f171f95110…

MALICIOUS

PDF

58.8 KB Created: 2020-12-19 05:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b9871c3aed7b40ec4619e55ed63b8299 SHA-1: c30f789281ba1fae87ddd0891211dfd095ca14c5 SHA-256: e41fd9f171f95110336f11b0798d946ddb1f9228e631d45afb906126f51f13fa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to manipulate search engine rankings or distribute malicious content. The primary malicious URL identified is trafffe.ru, which is likely used to host a phishing page or a second-stage payload. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=climateright+by+cuddl+duds+2+piece+set PDF link annotation
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/waxipiwazesoj.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/06d7b7a0-db99-416f-bae0-910e76b2addb/fokexuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/elements_of_comedy_films.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce4a6ae1a8af6ff4b114de/t/5fd621cf9264095525cb9c02/1607868879975/77200486644.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/96149657765.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5112e12facd59cec7c30d/t/5fd1a52c880fa23343d0e62d/1607574830647/cooking_tycoon_mod_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9bdb972-b9d6-4738-bc47-01d73b9a7caa/benonin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91d9036-a24b-480c-bbf1-cd2647f37efa/kodesuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d95e811-8c12-4305-9ed3-5a4fb0964f60/31278096681.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcec0c8527e39196677e8f6/t/5fd68a495488895576b1cb6f/1607895625940/deligikatevum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8317da82-f08a-4992-8d4a-eade95d32d29/confronting_inequality_paul_krugman.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_off0000a816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA816 5768 bytes
SHA-256: 0ed65c019bf393616b66dc4b258fc8a31635dbed11b7a255e48edc643a552c84
font_01_sfnt_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 10308 bytes
SHA-256: 0b04db0572b1607dc853b3ebde844cb7d2cd581ac3f96b15f62cdff352660f50

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