Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b6ccdf343a732…

MALICIOUS

PDF

69.6 KB Created: 2021-03-14 06:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e879122415072c7f02032211ade9a037 SHA-1: dfb93b8e636d973524f7513eed3c1c9e1135abf8 SHA-256: 308b6ccdf343a732d3928a17b9ff5f2834f7ea9c013a675c80997f0b8431cdc9
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-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://kuzutuzo.ru/strik?utm_term=maytag+neptune+electric+dryer+not+heating+up PDF link annotation
    • https://witokilufixag.weebly.com/uploads/1/3/4/7/134739393/713ceeece9.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/2799028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5fe9353ff060b.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/fusirodipuwusel-xirugipoga-dokixip-supewadepa.pdfIn PDF document text
    • https://fodibiwowi.weebly.com/uploads/1/3/4/4/134479135/bipisod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fd9af1703118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458628/normal_6004f8a9d4c27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5ff64cea43023.pdfIn PDF document text
    • https://wuganinaviset.weebly.com/uploads/1/3/1/8/131871642/7834f5fed6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_604d3bf9c1b86.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/4506734.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/xexija_gelol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ff0dc9e2ca0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwawabegopit.rf.gd/desutu.pdfIn PDF document text
    • http://wuvasof.epizy.com/zaminone.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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 5264 bytes
SHA-256: 48ba5e176eaec9afdc0b838f070219ad075006f5923653578fa418dd767345ab
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10308 bytes
SHA-256: a3a9a70d29a5423fe8bea63c730c6f4e2c81694ea6f9164ab7338446912a21b2

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