Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0398cccc5184894…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 17:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fbb32faf553f56e2929ee27b89cb652c SHA-1: 97bb98b98886f2a61481817f43dfe034641c3a43 SHA-256: b0398cccc5184894ec4f28ce6c0fceface6c966ae32008717d51fea93f7d20e6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable or associated with malicious redirectors. This behavior is indicative of a link farm designed to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to malicious sites, aligning with spearphishing tactics.

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
  • 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.
  • 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.
  • 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://yafferge.ru/aws?utm_term=ataraxia+significado+pdf In PDF document text
    • https://cdn.sqhk.co/wubofuse/jcjhFic/72055772423.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/989ff4e5ece.pdfIn PDF document text
    • http://skout.tech/sqlite_android_studio_pluginahr2v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5fdd6013d1cc3.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/QparGha/3662479887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fd6c818431d8.pdfIn PDF document text
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/jubefe_dexagitumi_kijejetigop_kegusud.pdfIn PDF document text
    • https://xoboxevoz.weebly.com/uploads/1/3/2/7/132740619/visovezadujanuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/dwhfgiu/switzerland_covid_vaccine.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/Hie0HFy/wimugul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_600addee2d595.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/wiwuxot/mebuvosawiselumizopuvito.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/lisusababe.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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 5348 bytes
SHA-256: a5096169d81933df6cbe609c7fd6232ebb7d2789364f781ad7865a040311e672
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 10884 bytes
SHA-256: 70d51fd92c29752ab0901538eef845286e2b5cbbcb061ac413de67c5422d206e

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