Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd6f983f001b44c…

MALICIOUS

PDF

73.5 KB Created: 2020-11-17 14:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 075ea51587b904ff1f2237734b6df1af SHA-1: 966ecd2ac0b461b718ae71ab4717605c07d4b444 SHA-256: 3bd6f983f001b44c2d2e58375c7b027d9bcf36d73c4394ea2a30654d5cb0eaee
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=statistics+in+a+nutshell+2nd+edition+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f890dfa290b2.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/jopufinituxixo-bopozotoloruzo.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/9b6ecd.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/842634f4f8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5f905c2682b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_5f9a573193ed9.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/bovujiburu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f96e35d69f18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ababc3-b17c-4a91-9a79-8c13e0f9f20e/turixipewexumamatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0c9990-2c27-4551-bb46-3c9f045e3e5e/kofimekuwubofuwuzanizij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28a454a-9aa7-4dc0-85a4-47d89fc9bd8d/vasili_zaytsev_zinaida_zaitseva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff36e56-5b53-46c5-99df-407de541fb19/99724383717.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 5476 bytes
SHA-256: b74669a6e51f0c9f864a20045b142f555de3a7b86f48b50cdd0f7a4063e82a76
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 10228 bytes
SHA-256: d2527b7ed321b1bb6ba09c850c7369f959e03f3e354a8a00395b291ae3e01b19
font_02_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 16804 bytes
SHA-256: c0eb310fa74b5327a12c7ec980df5448546c90498c01aaba51fb73e299195a1a

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