Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b253e088790ce…

MALICIOUS

PDF

45.4 KB Created: 2020-11-07 07:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ce8256ef5a8fa99c35060f412fd7be3b SHA-1: 13d6351b7149a8c549a40b2f309f3e3882b6a426 SHA-256: ef6b253e088790ce47bed3304e61e3cb8a8cf634fed847b68316f86672f5c3b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://traffset.ru/123?keyword=greenworks+pressure+washer+manual+1600', is flagged as unknown reputation, indicating a potential distribution point for malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?keyword=greenworks+pressure+washer+manual+1600 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/aradois_100_25_bula.pdfIn PDF document text
    • https://fifidoged.files.wordpress.com/2020/11/zukovekotikur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde8ff13-1333-42aa-9b1c-e64def94b604/58555020010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6042cf83-09e7-4a6d-b060-d144afe0e986/nubemijorokegon.pdfIn PDF document text
    • https://zefegize.files.wordpress.com/2020/11/worksheet_64_muscle_contraction_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1324571-18c2-4f13-af3a-d8e4b17f2faa/vofomipuzoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1938a507-dbf8-4334-a25f-8d037f5bf300/nurabolokak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d3a5f9-989e-44e1-93fe-5d2338874e66/kudesabin.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/cpm_calculus_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/beads_in_hair_trend_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/3203948065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb7ce1d-9422-4449-a973-1edf869a8c9a/kifixazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25a26f4-9a85-4c4d-b381-d2e299862ec8/83980416366.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/limbo_mod_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/40708231886.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_off0000710b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x710B 5596 bytes
SHA-256: a5c81778d18750a11fdba8aaffe9479d4eb3e164a0bf5dd3a570ab45f6fa2abb
font_01_sfnt_off000083fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 10676 bytes
SHA-256: b81e6d56d5f26be152d85af00f7741f13e76c59ff2a214960a6647f93f0aee80

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