Malicious PDF — malware analysis report

Static analysis result for SHA-256 139c31ba52e73624…

MALICIOUS

PDF

53.8 KB Created: 2020-11-06 21:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 62dd45cd31841fb0b872b27f4676f235 SHA-1: b7d12bc5c35b0091979e44f9fb63118f20b1dacf SHA-256: 139c31ba52e73624129d33d4b3883efe4ee63d451725d92cf38efb8fa6fdc238
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards an attempt to lead the user to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection 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=guilty+pleasures+laurell+k+hamilton+pdf PDF link annotation
    • https://xamurifepugep.weebly.com/uploads/1/3/4/4/134484548/lepawodo.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/71560.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/221ff1d70bba6.pdfIn PDF document text
    • https://tetikofigutuda.weebly.com/uploads/1/3/4/4/134445118/4ea171e.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/tomirukabikuxidufigo.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/bopanuzeruvu.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/pimijo-gexowubulilur-rebajenumot.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/88c0b126d823b.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/2114535.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/00ca99ec-1cb0-49a6-b67e-5424af7f65d4/zinejinitudemebusu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/40168702136.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/find_answers_clip_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070b3093-0f8a-4eed-865b-f962c3d8e1f7/main_idea_graphic_organizer_in_spani.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/lefolan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 4556 bytes
SHA-256: 0f537c5f09246cc37e7b591880864179715f325bb7b8a5ca6cbd8c672c13d3a4
font_01_sfnt_off000085ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EF 5360 bytes
SHA-256: 2af8f0c2b36d9c1f0057408a34b6bef1c392ac2050a08bed67004807a729969f
font_02_sfnt_off00009808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9808 10296 bytes
SHA-256: b38f130ff21ad97b8c28818c2f85e863ee180e59b10a948b37032587872a6253
font_03_sfnt_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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