Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc275da01455595…

MALICIOUS

PDF

71.6 KB Created: 2021-02-27 15:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0f4ae64273052013c49d570952485307 SHA-1: 819a68254fb8c51f2366b5aec9a3015bb8088a9a SHA-256: 9dc275da01455595ac045517be007dcd0294acd81a86ae4a3cbf578b904cbf09
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure malicious activity. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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/123?utm_term=kenmore+elite+he3+electric+dryer+service+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_6037549bc3f88.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/jixaxole_dodopabinul_pafaluporo.pdfIn PDF document text
    • http://samyog.ru/lovuzogopikudizipxiara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_600cc7d763b92.pdfIn PDF document text
    • http://storezone.info/title_page_template_google_docsx1a02.pdfIn PDF document text
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/a80b5fcfb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_600e055e047ab.pdfIn PDF document text
    • http://astrohelp.space/albert_pike_morals_dogma3xwq0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6031f5bb43c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6033e96821a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_6001830c14c21.pdfIn PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/xitagotanamajim-topiver-kuluwibojepiril-wotorine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_600eae39b4e2d.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/suzixegazunow/dhs_child_care_licensing_forms.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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 5472 bytes
SHA-256: 8117a8e531a80c70e47469aecd79000825e9167866369c4a3bf4ed321cd65e42
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10876 bytes
SHA-256: d84056a8a343b65a3cf876c3fc26e918a1b70642a0ffb6dddb819f68f2f44f3e

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