Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eb8c9f16d6d7e3…

MALICIOUS

PDF

73.7 KB Created: 2020-12-27 22:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9a5e3e5de55ca06d361c62d249f27ade SHA-1: e6b5a23f41c19e5740e8e62e545f05f4c27bba34 SHA-256: a4eb8c9f16d6d7e337a4e1fda9d3bf2fc027aa702e8ae1e50c52b3b2766881cd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or SEO scam designed to drive traffic to potentially malicious sites. The primary external URL observed is traffking.ru, which is likely the ultimate destination for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=liquidity+ratio+formula+for+insurance+company PDF link annotation
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/86b7aa1b6f8449.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/391444.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/fijelute.pdfIn PDF document text
    • https://pukuxenusafo.weebly.com/uploads/1/3/4/7/134711282/kolutubim.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/6154678.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/576ff6.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/rebukoneve.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/578c5.pdfIn PDF document text
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/jexuzelomanojipil.pdfIn PDF document text
    • https://zatugole.weebly.com/uploads/1/3/1/8/131856706/xafawikenogudakixe.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/jewazuna_vosixujod_ditugizosepivu_gipejululakiw.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/kizewegavikat.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/cd56bed.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/c1702ffd-1a9c-44db-8322-33713cebecd7/5663524047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fde1b9-7cb1-4338-8b46-4ade80c00dec/vtech_cs6649_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/interview_evaluation_sheet_doc.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5468 bytes
SHA-256: 4690ee3c7d5c6cae8ab19bb72ac1841a9deccd38714b93492d8af41b79bed382
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 10468 bytes
SHA-256: 85b8e579e3c43921a57dcb0acceb89e8aeb02a6c81c0aba3fe4c6e5cf4cc5c81

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