Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a378227209a3c67…

MALICIOUS

PDF

35.9 KB Created: 2020-11-06 16:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bec81523f44c2c09e10ec52520eb0616 SHA-1: bfc8218d33267819fa0e336c61e7a88975ee2902 SHA-256: 7a378227209a3c6724341a6387bffb4142ab98fe6f6d15108fe6365e05c86f8c
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains references to URLs that are likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafftec.ru/aws?keyword=asi+se+dice+2+book+pdf PDF link annotation
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/fekikuz-jujixaluba-lubosazideta-kuvenor.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/b2531048befddf8.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/zeleragaluvul.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/golosumixo.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/3347896.pdfIn PDF document text
    • https://durabaseduxoj.weebly.com/uploads/1/3/4/2/134235759/xotujizazute-kenev.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://s3.amazonaws.com/bizamesuwepe/35922581109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f953f52b-329a-4ada-a3b4-3e0f9e457aee/reimage_pc_repair_license_key_list.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/dizapujoxomazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7999ab8a-49cd-43b4-8369-aa6479fc1590/poxefajirevapurisanonufap.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/dmv_kent_wa_phone_number.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4273 4740 bytes
SHA-256: 84db1245d69782035c86390ea3a7ac5464873881c692e5f17d44e138d5293d1c
font_01_sfnt_off0000528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x528D 10180 bytes
SHA-256: e833d3fcc871d723eec250700d0ceb63785ec4d60b26d7a458124eae4fed2b05
font_02_sfnt_off0000750f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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