Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5469c74b4f8f4c…

MALICIOUS

PDF

69.5 KB Created: 2020-11-18 10:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 851a6b5dd28983534cad389e9bf3ae3a SHA-1: 31ffa443d47f35fd7c8092dc9b7cc5e492fdbdcf SHA-256: 3e5469c74b4f8f4c41600d697cbf49ab29fb3d79f1c13a6588bcbcc6ae3817b3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a significant number of embedded links, with at least one identified as a malicious redirector. The presence of a large link farm and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a phishing or malicious redirection scheme. No scripts were extracted, but the document's structure and link analysis point towards an attempt to lure users to malicious sites.

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
  • 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://traffmen.ru/aws?utm_term=business+communication+skills+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fa7085144874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f86f8fa18461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f932ab575996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fb4b3be38a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f9c78cc21d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f8cb4ea7f462.pdfIn PDF document text
    • https://faxevirasobiv.weebly.com/uploads/1/3/4/5/134597887/lokedoxel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5faa212772f37.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/zetare/zazerejezime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf4f57e-d7c4-4a9d-8b60-e09a0031f083/webavorusepesejotixamixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4755e887-a20a-4e29-ad2a-fdbfa29e47f7/98572989173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9871ed65-a916-44ac-ba40-848feeb10e19/exercicios_resolvidos_diagrama_de_br.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b51ed6-1b3b-4af8-8ab1-bec563288a95/38325900804.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/french_bulldog_for_sale_in_michigan_grey.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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 5416 bytes
SHA-256: 89af558e0df3890be0f95112e7513979f3543083b960b488c11455119123c57b
font_01_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 10132 bytes
SHA-256: 5c00adc4c6d996d90ca5b9c8cf92c29fadeaed76ca279c2c17812d69f0c925ef

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