Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0d282f1c3fbcb7…

MALICIOUS

PDF

178.4 KB Created: 2021-05-17 13:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a9f3fdaa49033a6e84b3574ddcde78fd SHA-1: 31276ed2a23862f39fa3d42c31941bfbe2aa0fb9 SHA-256: 0e0d282f1c3fbcb72f5820629822d0774593cc4bd051f2ef9a1adc8d42fcdf6d
66 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 URLs, with a high-confidence heuristic indicating it's a link farm on disposable hosting. One prominent URL, 'https://pelibifir.ru/strik?utm_term=understanding+human+communication+13th+edition+ebook+pdf', suggests a lure related to a book download. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://pelibifir.ru/strik?utm_term=understanding+human+communication+13th+edition+ebook+pdf PDF link annotation
    • http://hightrade.club/3804851136umdyz.pdfIn PDF document text
    • http://creditactive.info/memalamulubuzakimajokava481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_60380b1908c37.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/cd720c64950fc11.pdfIn PDF document text
    • http://padakogako.iblogger.org/guwegixopimajatorozazol.pdfIn PDF document text
    • http://dvestideyli.xyz/wayne_dyer_wishes_fulfilled_quoteswvxxu.pdfIn PDF document text
    • http://bagajuz.iblogger.org/budataf.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/6988ab5c.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/gikufujirusepe.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/4481318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_606e82b6573e8.pdfIn PDF document text
    • http://findssldz.xyz/15103522384a427i.pdfIn PDF document text
    • http://art-practice.org/259908916416xixd.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/11a99d06-6618-4281-beab-1418d6c5e709/vilar.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/moxaxojitufikenek.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/dakidodet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d994065-1155-4468-abc0-d5c1bb4374cd/oklahoma_cdl_tanker_practice_test.pdfIn PDF document text
    • http://sumotun.rf.gd/24824071419.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/venaseposikab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8beedf30-2a37-4e38-bb76-70d553b2d068/the_little_prince_online_movie_english_subtitles.pdfIn PDF document text
    • http://tujijekaxevon.rf.gd/8255144857.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/10648085210.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_off00027b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B30 5948 bytes
SHA-256: 7503d11d3a00882a5a2ca6595c40e9b754ea481951c4b46c05eafb65955d296f
font_01_sfnt_off00028f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F51 12364 bytes
SHA-256: 2d87fdb128a21381a8915f58cc8eb0c926501cf5ce01593d4d05135c51085172

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