Malicious PDF — malware analysis report

Static analysis result for SHA-256 a516399f12aa1c1c…

MALICIOUS

PDF

75.4 KB Created: 2021-01-06 19:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ce8a13c9070953ad9763b4efd0bc806c SHA-1: 95122b38ce934be995daa1aa1879cda7114880b5 SHA-256: a516399f12aa1c1c43729741661510f45b6b375aba6431cd0cdbf1d0f45dde4f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'ML_NYX_PDF_MALICIOUS' and 'ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' confirm malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=2018+monthly+calendar+template+july PDF link annotation
    • https://xapotaligefako.weebly.com/uploads/1/3/4/6/134612972/zudigiwonu-tetonusupugu.pdfIn PDF document text
    • https://sanaxuruvumuvuk.weebly.com/uploads/1/3/1/4/131438582/sopapu-vuriroli.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/gaxudem.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/b8060a85b5916c6.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/3328013.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/2384d.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/nukesezavore.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/gozavexilepix.pdfIn PDF document text
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/xapowubijuvoxikogeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fb5a4df0df68.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/lixuzo/58397798016.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/air_france_787_business_class_trip_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd854d1-24fb-4529-911d-b2242a5e78b3/54138177871.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/43868501027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16805820-ff91-4ab1-b463-f49d7796d5d6/wutatag.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 5736 bytes
SHA-256: c3f829c66b177bfa6788e11463e65e98414536380251f8a369ba579e6cd8a9a8
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 12672 bytes
SHA-256: 1d4d4ea33cc5b05655b389c187f122b2864819cff1ae76459d42dee03ec889a7

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