Malicious PDF — malware analysis report

Static analysis result for SHA-256 0373a5953c10a24d…

MALICIOUS

PDF

41.4 KB Created: 2020-09-30 01:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5e8185127b6cd95a4b95fa5814c5a7a7 SHA-1: 95269c4f2daa8b17aeae9cd228a55246996d7e1b SHA-256: 0373a5953c10a24dbf336ecba4cf104eeb2bbf231f80fc499dd5832177937a6b
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a lure to external, potentially malicious, content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://cctraff.ru/strik?keyword=jurnal+blanching+pdf In PDF document text
    • http://files.wellspringky.com/uploads/1/3/1/6/131636879/617f5b.pdfIn PDF document text
    • http://vevowon.rideforjase.org/uploads/1/3/2/7/132710700/5908633.pdfIn PDF document text
    • http://files.bigloveletters.net.au/uploads/1/3/0/7/130775688/lowufabew.pdfIn PDF document text
    • http://files.innerartscollective.com/uploads/1/3/1/3/131380558/mebuxi.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/renimupaxawaxisefisefafox.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/kogapunap.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/24180930771.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/zofixafinobiteseliguziz.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/45940500212.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/wezowiba.pdfIn PDF document text
    • https://site-1037088.mozfiles.com/files/1037088/73068601799.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/xerixaxobo.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/54322f1d-e720-4a56-a898-c1695a7c3563/70578505953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a2f300-3bd6-4e88-98c1-93a2d3f406f1/70310630907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb596a00-ec6f-4d90-bda3-ee7240552d64/kuvulusano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93faf8f6-e9d2-4d2f-9f9b-0fed2b869244/jugij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc3ca4e-679f-45c2-86cd-deec092e6a9e/33273838369.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_off000065b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 5368 bytes
SHA-256: 8792b9cd7722617283fd4d740069125222dcaefed8323dd190a7f7111877cc27
font_01_sfnt_off000077ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EC 9808 bytes
SHA-256: 2ca55248afbe1e4ebb73ce119be897781f2c191ddb93ff2e97cba858d9106517

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