Malicious PDF — malware analysis report

Static analysis result for SHA-256 12536a692e31f822…

MALICIOUS

PDF

63.6 KB Created: 2020-12-09 11:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 638a1a892e7a31c4614018be34a36ee6 SHA-1: 90225b75352931c4439a7ca994153683cc65c5ee SHA-256: 12536a692e31f822a212b0ebd325e9656a21d96b1636f25b8c27373692d5850f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9997

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 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://ggtraff.ru/strik?utm_term=the+immunology+virtual+lab+answers In PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/vonoxavofub.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/pijil-zugujekale.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/169485400fe.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/bonokawewolegiv.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/muropur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dda40d83-48b3-4601-8238-0731dc409e2a/mucho_ruido_y_pocas_nueces_william_shakespeare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64be6966-9126-4fc5-96bd-713b8ee94ecb/7662936362.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc052d83dfdd95b60d21819/t/5fc145d5f81c9a2a0cd0d8ce/1606501848947/64887820368.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/anti_aesthetic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3978f597-07e6-42c9-9191-4068a3cb4ea2/42789160252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39859130-2d40-4a49-8411-33e209253d45/goguxidibabifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2ccae0-65b4-499b-a308-b984cd74a7c2/65512986193.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 5324 bytes
SHA-256: d891a725eed6f0cdbee86086392ba611d5bc25244851e8397c5c9b930b444328
font_01_sfnt_off0000c0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A1 9796 bytes
SHA-256: 34a6fb947f6675b9ae7d41a82a4ad827fe726a1f699b867dfabf71e011a299fa
font_02_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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