Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd0a4cdc8f3b91…

MALICIOUS

PDF

86.7 KB Created: 2021-03-14 06:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9ea6d5c7fc1100ad0eb5423e3939aa8f SHA-1: b2a5e4e2d2d7ab20fc464975a2ca5851acca9fd7 SHA-256: a0fd0a4cdc8f3b91df11ac6814cfba58ed3547452f31e7c71277a0b4f66d458a
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF download pages, suggesting a link farm or phishing operation. The primary URL, 'https://soxebez.ru/award?keyword=bernarr+macfadden+pdf+books', is identified as an SEO redirector for free-download phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to distributing further malicious content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/award?keyword=bernarr+macfadden+pdf+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410985/normal_603698bf32524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381091/normal_5fe561d9a6f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_60412433d17e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5fcf404642975.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/2261816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_603e33b3bb0f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ff314157afc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_6023b227b4c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_601d3dacd423c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_6008e5ae02a10.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/4361408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_60226808b43c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_602c300167f97.pdfIn PDF document text
    • https://pupuzufasu.weebly.com/uploads/1/3/4/7/134759867/8441871.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/b4608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fe0c616db442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_6029fe7b9bad2.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/medaliwifufugel/aukey_table_lamp_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/aprilia_rs_250_performance_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/qantas_frequent_flyer_membership_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/9054859673.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/ranenupidoxizukevejijifa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/42451714932.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/economic_development_agency_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/82270162941.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_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 5524 bytes
SHA-256: 45ec9eef49582007d671eaa45a77f676460d1e7437b8353b94aa2bb0eaeb2138
font_01_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 11068 bytes
SHA-256: be0434258ac7b3241ec1fbbbfd8557d42998d48ee227a35b5aaba18ad60b54ff