Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffe9fd769f7b171…

MALICIOUS

PDF

72.4 KB Created: 2020-12-30 13:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8685cd43e091baaf8f65db6d7d07631d SHA-1: 775c2e09ec3f216edfa54cea72b236dac32a9044 SHA-256: dffe9fd769f7b1711f1ccbc401b6d597cdf4bcbf10e12d623a2bc3da8715eed6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads.

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://trafftec.ru/123?utm_term=thirteen+reasons+why+study+guide PDF link annotation
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/2069148.pdfIn PDF document text
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/791d31b194.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/agjjjay/fake_call_log_app_download.pdfIn PDF document text
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/32e13f34e63ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_5fbd9a737d029.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/dugikaxis_xumil_medudig_mupofi.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/PShegjl/occupational_health_definition_according_to_who.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/RYXDCr6/dulapekoromolafisuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_5fb337e35252a.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/gfWOia2/racing_form_race_results.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/RiGggnB/duvusijipurifanaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/dsVpwhh/nuwemezegomavakejafaw.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.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/1cb34c53-0014-494b-9434-f02a904b059f/88586505892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8908405b-86ba-4a24-9f35-b8db688cf9ea/74200098432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99868ecf-3b8c-443e-88c0-12af72d39654/mini_basketball_hoop_walmart.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 5200 bytes
SHA-256: 255ab9ce768f898711b92a6e8219169b0f39b7c846e5a0443c85b30a9b704222
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10952 bytes
SHA-256: 5b737bedb9af7067cd17bd4fbfee3c60e2c509338ff28cd1ab2b7fcd8c63fc32

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