Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d878a12b54e6c2…

MALICIOUS

PDF

67.4 KB Created: 2021-01-01 21:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d7f706d8b35d71b744750eaa1cc00adf SHA-1: d7bec95816c3cd9b76c814f790bc7a69b636d02b SHA-256: b4d878a12b54e6c29fdca0b11c9721af9250942a983728a884a2a96e303a7bb7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure for free PDF downloads, a common tactic for phishing and malware distribution.

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 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://gettraff.ru/123?utm_term=human+biology+concepts+and+current+issues+pdf+free In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/2829829.pdfIn PDF document text
    • https://xemifedawunata.weebly.com/uploads/1/3/0/7/130775780/ddab4628fb.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/8936772.pdfIn PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/8954724.pdfIn PDF document text
    • https://kobipisi.weebly.com/uploads/1/3/4/3/134312725/7799058.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/ronufadideku-topokod.pdfIn PDF document text
    • https://puxusatorujebi.weebly.com/uploads/1/3/4/7/134749887/zupatopozokin.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/hfzGhaC/54416578224.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/edd7fc16-fc27-456f-92cd-75fac5d81299/jagunubavutumanasowezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec1c348-5b0c-4511-bf9c-58f0f9e3cfc8/7578515716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c1e3bb-f714-4677-a7c1-7c7f4d0c4f73/kebelekimunifaliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e93d3ed-a815-49fa-9296-dfa4e4cb6d07/91715693880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6be268-aae6-4f4a-aeaf-5bc34723555b/pluto_in_the_12th_house_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09994e3-bf18-4157-aea2-8521ba5eb5ad/3001_a_laced_odyssey.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 5680 bytes
SHA-256: 7e78fe5fe93ef477b39f254d4d62d2c4c9c9fc403426f08dce2cae722b288cf0
font_01_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 11076 bytes
SHA-256: a6faf0b7e914028b89ca359e5b851287edfe74a49f1202c61221590422866dc6

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