Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42c213ca8089665…

MALICIOUS

PDF

61.9 KB Created: 2020-12-18 19:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4ba0b4346aed0c431f785776f335caa6 SHA-1: 8665cb08a908a7b469137dd79550db212c08e484 SHA-256: a42c213ca8089665dd9333b8d7c5a3d978530ec022dd1a72263270c5fde46c10
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The sample also exhibits characteristics of a link farm hosted on disposable domains, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=airsoft+grenade+launcher+holster In PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/gofoxaxavuxub-zegoj-tegabonep.pdfIn PDF document text
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/jopimomed.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/9869194.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/868ee5a05c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5fc2dcc98a489.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/kiwimor-genot-dexeroj-pisowakexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f9416be85209.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/dafopipisitopupusuj.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/2054766.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/792d51ac-14ca-46ea-af07-460e3e5cc10f/husqvarna_hu775h_service_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/apps_keep_crashing_android_oreo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfac7f3de5e49b52a28cf/1606286023848/new_center_school_calendar.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_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 5272 bytes
SHA-256: 3b47cb85a5e246b22e12192362dbe2558717d77d7849c03e8e8104328f41a0d2
font_01_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 10376 bytes
SHA-256: 53744ae9815e580dd4ab5d8cd6c7887a0113d1fa35e10477e6eef1ed3da92bd3

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