Malicious PDF — malware analysis report

Static analysis result for SHA-256 7753f8f35d5ba223…

MALICIOUS

PDF

67.7 KB Created: 2021-02-21 03:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cb30b3d3ca37f768520fb2a744b65c5 SHA-1: 9269a62c8291a2a5537ad99352840394ee8ad7ab SHA-256: 7753f8f35d5ba223fe3eb5fe6fb98f8784f5fd8f7ee8541e4fef3b9e045207ba
186 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 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://maypoin.ru/strik?utm_term=how+to+thread+bobbin+singer+4423 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500667/normal_6006ffcf4855c.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/gijudixigajatike.pdfIn PDF document text
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/7398224.pdfIn PDF document text
    • https://vekenotagiwupas.weebly.com/uploads/1/3/2/8/132815979/nagokipefap.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/tifizuno.pdfIn PDF document text
    • https://sadepejeriroxet.weebly.com/uploads/1/3/5/3/135337628/mezetewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd3cce27805f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5ff61a67bfb42.pdfIn PDF document text
    • https://nazolaruwesibag.weebly.com/uploads/1/3/1/4/131453197/mirekuguvoxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fd95b39619c8.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/dekulatinedeliwug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_602e610b6f823.pdfIn PDF document text
    • https://lalinixew.weebly.com/uploads/1/3/4/2/134265361/vexatobegoga-fupivoxunab-punarufokuz-duresubixux.pdfIn PDF document text
    • http://jikitosot.22web.org/mijadowavutajokefo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didajuna.rf.gd/37186887153.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/97101836447.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_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 5632 bytes
SHA-256: 2ae5bfda3f41fc463bcb53e3a8aed20dc5fef04eb7f6fe870b2c268add9a34bd
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 10512 bytes
SHA-256: 101e663efe045cfbbe9ff3b2084db294dc5789da29b4751a74b495ede830f324

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