Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8936d81ab670b0…

MALICIOUS

PDF

56.4 KB Created: 2020-10-08 14:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e7ab0f929f95400efc38d9b6f226224d SHA-1: fad56f2b022456cebc09df76b9e21832e3915a4a SHA-256: 0c8936d81ab670b08c43b98f0cb9812490611bc6beff17b1637c8103e26b1bfb
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for "ressources humaines film analyse". The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a phishing lure leading to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/pify?keyword=ressources+humaines+film+analyse In PDF document text
    • http://jagopib.mobotflexi.com/uploads/1/3/1/4/131453718/ronopom_fajix_fusup_pupejuzo.pdfIn PDF document text
    • http://files.clintoncountycasa.org/uploads/1/3/2/7/132740193/a58e93.pdfIn PDF document text
    • http://zoxeza.davezoby.com/uploads/1/3/2/7/132741508/sokozevovuxibosabi.pdfIn PDF document text
    • http://files.himburgelectronics.com/uploads/1/3/1/3/131378991/9038526.pdfIn PDF document text
    • https://site-1036864.mozfiles.com/files/1036864/15681129286.pdfIn PDF document text
    • https://site-1043218.mozfiles.com/files/1043218/zebefijubozefeg.pdfIn PDF document text
    • https://site-1043574.mozfiles.com/files/1043574/88805720564.pdfIn PDF document text
    • https://site-1042345.mozfiles.com/files/1042345/deravusokuzi.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/xoxediwanovidow.pdfIn PDF document text
    • https://site-1036756.mozfiles.com/files/1036756/34647004834.pdfIn PDF document text
    • https://site-1038382.mozfiles.com/files/1038382/87655472880.pdfIn PDF document text
    • https://site-1042635.mozfiles.com/files/1042635/mofakolazetazikuniwumakup.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/5365a47d-1f1e-40f3-824e-e59e2f49e66c/1007503935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13698a6-9360-4768-b8e0-728ba9d78ca5/62026765904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2af2a5-f174-44da-89a3-86476a97d63b/kojula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73d0c3c-3a86-49dc-b8f7-0b4ecb352719/47914052195.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_off00009311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9311 5032 bytes
SHA-256: 06460c01e1d3b657d1559cfe3064aea9c583a7b27af5d91064cb2d0b47375993
font_01_sfnt_off0000a40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA40A 10052 bytes
SHA-256: 4884d4a34dc8a12afdc048751189fe59f955060341dbc0b93de19f4b829bfe84
font_02_sfnt_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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