Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d43b9d9712d1a09…

MALICIOUS

PDF

43.7 KB Created: 2020-11-07 19:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6bd79c2dcce6012121d88230fbb2434 SHA-1: bcb383725d725bbd0e189855823c3ea1df79443e SHA-256: 3d43b9d9712d1a091bd46194a9e96ded52eb15dff195661e90a32cae4b07cf28
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://trafficel.ru/123?keyword=giinii+7a+dpf+user+manual', is directly embedded in the document body. The ML classifier also strongly indicated maliciousness. The presence of numerous external links suggests an attempt to manipulate search engine rankings or redirect users to potentially harmful websites.

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://trafficel.ru/123?keyword=giinii+7a+dpf+user+manual
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5f966929d9027.pdf
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8d14a113d46.pdf
    • https://sumulejuno.weebly.com/uploads/1/3/4/3/134361372/dd76f.pdf
    • https://gigewabiwijezu.weebly.com/uploads/1/3/4/5/134576475/6345487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/42766c35-92ed-4b38-b385-4ef6e5462f34/wapuzodiduzotago.pdf
    • https://vevadiwo.files.wordpress.com/2020/11/blueprint_reading_for_welders_9th_ed.pdf
    • https://fozigolo.files.wordpress.com/2020/11/your_money_or_your_life_2018_free_download.pdf
    • https://fanunopufimu.files.wordpress.com/2020/11/penaj.pdf
    • https://uploads.strikinglycdn.com/files/5c318f7d-bb62-4d09-8284-e88d7cc2948d/jelafedijixogefe.pdf
    • https://sirilab.files.wordpress.com/2020/11/mujalego.pdf
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdf
    • https://s3.amazonaws.com/jifesu/glencoe_virtual_manipulatives.pdf
    • https://zusepofofone.files.wordpress.com/2020/11/zelatagapalezufopeze.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_off00005f1c.bin
7d5eafb72eb1a994914c5d1bdd7cfdb4b350739b6a3c857ace30b30fe4742c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 4992 bytes
font_01_sfnt_off00006ff8.bin
7677ec8b8fba6ccdf850cb19711a479674dffbafb595bff4340dd52a18616303
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF8 10620 bytes
font_02_sfnt_off000093d9.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x93D9 4324 bytes