Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d7cc47cb216ad1…

MALICIOUS

PDF

83.4 KB Created: 2021-05-19 13:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d6215e457e84e44de62f498accf202df SHA-1: ed4a0094fcfb3ff379041b44979d68172066bacc SHA-256: 34d7cc47cb216ad13007e4347af36fb63b7806912d6f0f7094437427cf977ab7
96 Risk Score

Malware Insights

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

The PDF document's metadata and heuristics indicate it is designed to appear as a legitimate document but contains a significant number of external links, a technique often used for SEO farms or to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=sample+reference+letter+for+school+social+worker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe1661aa068a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_604eed227330c.pdfIn PDF document text
    • https://numezuledidi.weebly.com/uploads/1/3/4/0/134096646/porer_fixatas_taxaguvu_fofibegorebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fddaa73ef44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fdb63306cd0a.pdfIn PDF document text
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/165bcd.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/b659f2f46b2fc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_603ce638676ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5ff1f23d5cbad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/physics_punjab_textbook_for_class_9.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/65344795539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb0e144-c8d8-49be-9be2-eccfe7d118cc/fifty_shades_of_grey_book_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207f9320-439e-4022-a4b7-ad064f19b223/93183026312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e594af-c982-4244-b400-90f267d52075/65935032804.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/doubling_and_halving_year_3_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/91659978635.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/84230587005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23a8a9f-edb3-41ed-8209-6285c049b179/foucault_biopolitics_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/1086563634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41edde40-4ae9-43db-8ba1-2f1ee9f6ec19/65364665723.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/99212797884.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/xudujesabujelalelujagumin.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_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 5512 bytes
SHA-256: 7245d3afacf4ba06026733d436538495d610313f4a1aba57ae1e4a3438059d39
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 10272 bytes
SHA-256: c4a8fc3669cbb2d0ed9df856e29f062be859d91ec6d80c20e9ff61217ac2efaf

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