Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ba9845473c6772…

MALICIOUS

PDF

73.7 KB Created: 2021-03-29 21:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9ae9ffa5eb533adaf7195671bec7482 SHA-1: 5b2bfa3b84d4a4fd7bf3dda05da21623f5a973f9 SHA-256: 75ba9845473c6772ade2a7ad1419959ffa653a6c20a91b924eac2dffeeb44b5d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://golowaki.ru/strik?utm_term=2003+chevy+cavalier+maintenance+schedule PDF link annotation
    • http://gufutaca5.xyz/nifuvirefamumufirovonee431y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_604f8a5eb5b92.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/meragukewijoluvararimreacp.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/9692282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5fff043e0d7c8.pdfIn PDF document text
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/67b7501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_5fc7d8c027014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_8448923d071b469cb7697c9455041c98.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_f106c7fb6b634b249e1598a043ec76d8.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_24853740e1ff45e09ddfb04a43883907.pdf?index=trueIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_422475ad847b44939fa0d7a96270b04d.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_2e0bb78b5ccd474f96201cf4d16b6f00.pdf?index=trueIn PDF document text
    • http://mutidulofof.epizy.com/craftsman_25cc_weed_wacker_wont_start.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_139bc003d1884180a4b40809cf30027b.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_886929a246a74868bd0135bff4b229b9.pdf?index=trueIn PDF document text
    • http://nomekerileme.epizy.com/islamic_books_bangla.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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 5684 bytes
SHA-256: bc4d302a73c2b6858368eafef7909da5d3c7b9e2be3b2168a134d66bb52288dc
font_01_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 9856 bytes
SHA-256: 56faedc5bc909a5d26be89f61d5fe76d80f01308659f3c09e27c33747bcd9f9f

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