Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadb250bc5182320…

MALICIOUS

PDF

98.5 KB Created: 2021-03-16 12:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e09189c1ef18b1b68bbe9a2498b5194 SHA-1: b20ed9199a14f42fa1dd7f9ef864b231943ca281 SHA-256: fadb250bc51823203b004102d96fbefc8d8ccfc6242350487ecee64b6240f426
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'dafemum.ru'. Heuristics indicate the PDF is a link farm designed to direct users to potentially harmful content. ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'free download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/award?keyword=free+download+britannica+encyclopedia+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_601d162b8d463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_6033ea0870631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_5fd7744b4e715.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/givonuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_601b7b4184b50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5ff9d19acbaaa.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/motawulanalojofoxax.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/0677a070-4cec-485c-b28c-6e069d08f84a/weber_spirit_e320_pricerunner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1cb15b-878d-4c71-a83c-777e6e942624/2000_ford_ranger_3.0_fuel_pressure_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdc23f6-b249-4eb4-8616-a7a3e4b1f606/kenmore_microwave_over_the_range_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72902666-36e4-487f-93d5-82938bad2f2c/how_to_get_blank_checks_from_your_bank.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/dujavizi.pdfIn PDF document text
    • http://mujunuge.rf.gd/15077182545.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/48971608856.pdfIn PDF document text
    • http://fugirar.epizy.com/back_to_back_stem_and_leaf_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/how_to_reset_ozeri_scale.pdfIn PDF document text
    • http://sejanaxopuvogiw.epizy.com/gcss_marine_net_answers.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_off0001431c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431C 5260 bytes
SHA-256: 36a6359a0eaadb2ef97b51704a5f564b207d22ac3160c6f4cbd66cb16d4c8565
font_01_sfnt_off0001552a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552A 11620 bytes
SHA-256: 97c4493bf02c6d7cdf33440fe583d5dc08c1a138e1443b32c3f8aab9d9dfcc97

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