Malicious PDF — malware analysis report

Static analysis result for SHA-256 6843ffb94c19a16e…

MALICIOUS

PDF

74.6 KB Created: 2021-01-04 13:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2ac8a036692c20f803bd40b4ec21848e SHA-1: ae3872e9a59b9c14f879f575cc2a8fc7172ce09e SHA-256: 6843ffb94c19a16e3a93df779bd3a8da374ddbf202c202de21f1e77bc8be8d82
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/wb?keyword=pirates%20of%20the%20caribbean%20coin%20song PDF link annotation
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/vinizogelu.pdfIn PDF document text
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/moroguzodi.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/b8504b0c36c09d.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/6485110.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/agdwV2I/49389050242.pdfIn PDF document text
    • https://fatatovol.weebly.com/uploads/1/3/4/7/134707957/sudaxawusijivojukuvo.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/giniraramebare_zelub.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/idrifpo/rudel.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/mezuxop.pdfIn PDF document text
    • https://jurajewokikum.weebly.com/uploads/1/3/5/3/135349146/fuxojo.pdfIn PDF document text
    • https://deketonozalupu.weebly.com/uploads/1/3/3/9/133997688/musubetovip.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/4e7f14bb-d9a8-4f36-ad6c-36441575a05a/flo_rida_good_feelings_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f92b62-6a47-4443-8716-2d408e0fb7a5/38363815598.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 5252 bytes
SHA-256: 5a075a14d781253c484285c98b9df934f416a41cc5752c63e3aa2fb65443778e
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10540 bytes
SHA-256: 21ad0eb68523e115561680adec0926936d167c9e75ffe12cb53f43ad25ea73c7
font_02_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 18172 bytes
SHA-256: e1ac5be57a6c23dacdae779b7cf19891ffedb4cf67d94cfe4279c41f7288dea7

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