Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bdcdf38212f2c8…

MALICIOUS

PDF

74.0 KB Created: 2020-12-22 04:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cb87017895567948ecff2e5ba92571b SHA-1: 732155e1191c0ca795db0bf2a9629f2a6a990401 SHA-256: 05bdcdf38212f2c8ec3cccb00bea7c6e94a8e42c631cf138e4522793a0d8baad
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary malicious URL disguised as a prank call application download. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm intended to direct users to potentially harmful content. No scripts were extracted, but the presence of embedded URLs and the overall heuristic firings point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=prank+call+wars+apk
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5fc449d9e57bf.pdf
    • https://nupadosizekibu.weebly.com/uploads/1/3/4/5/134597568/dimewekivebileruba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3930f11b-b395-44f0-9c36-0b49ce5fca06/xyz_affair_worksheet_answers.pdf
    • https://static1.squarespace.com/static/5fe00322ff074777c9865bc0/t/5fe0b7217f4e6a336758fc27/1608562466546/681137443.pdf
    • https://uploads.strikinglycdn.com/files/095c67be-b897-415e-9240-d8abe0de650d/53626993345.pdf
    • https://s3.amazonaws.com/wovigebi/zugiwutimomodo.pdf
    • https://static1.squarespace.com/static/5fc0e2b72bbd740658066ec4/t/5fc3c21ff8cdb769c6561347/1606664736510/blue_moon_princess.pdf
    • https://s3.amazonaws.com/mojivikapeti/49370283293.pdf
    • https://uploads.strikinglycdn.com/files/531f211c-4b44-4599-89f4-bf49dc610475/46739673508.pdf
    • https://uploads.strikinglycdn.com/files/d19be21e-002d-4c34-aef7-dc007e133068/88789057271.pdf
    • https://s3.amazonaws.com/memul/asma_cardial_adalah.pdf
    • https://uploads.strikinglycdn.com/files/37fbb228-2b21-4224-ab2c-7f8f9eccdb33/23793446647.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bd.bin
86c9755ae6006c2fac7ed71f84198fb9e2a182bedf33c81b2c1e82ed8be48531
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 4516 bytes
font_01_sfnt_off0000e50d.bin
1f22ae30bca1ef4ce289f8fa7976d9891dbf23d59b77172209178d023720eabe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 11632 bytes
font_02_sfnt_off00010b91.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 4324 bytes