Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afe0b35433ae62f…

MALICIOUS

PDF

68.7 KB Created: 2020-12-05 21:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db8370620bd2ecdfb292da1ece6f03c6 SHA-1: ce8aacd8b2d8a2d237377fc230094b67329b1916 SHA-256: 3afe0b35433ae62f89e053d911205a16b2eabf6e7b03ab60863dfc1926fdd4dd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute traffic. The presence of a giveaway lure in the document body and the high ML classifier score indicate a malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest it's designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=iphone+8+giveaway+2020 PDF link annotation
    • https://bujuwevirovumeg.weebly.com/uploads/1/3/4/2/134235487/c3724857.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/jiluludewedemibodegi.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/rozavulixifa_leziximin_lopavinodaxiwej_gexujoso.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/gotanugot.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/6062512.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/a4d080d2cc50.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/woruzokonugizutoge.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/1a28c496-bcfd-4ac0-8828-7e2763431c8a/explain_how_energy_is_related_to_wavelength.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab59c9ac-3889-4ef4-9fba-6c87e26acbbf/sims_4_household_limit_mod_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f864280-9557-4ef7-8c88-b3c8a2f7ff2d/necropsia_y_autopsia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d006b7bb-4f02-4efe-8958-9847a532e5fe/diseo_universal_para_el_aprendizaje.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/glencoe_algebra_2_chapter_8_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3d62c4-a8f8-4acf-b540-60602769a6d2/kewodarudawa.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_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 5436 bytes
SHA-256: bf4dafd3f0645bcfe643563a538066ac51dd9000dc7d963d3fed7a8c2d887742
font_01_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 10804 bytes
SHA-256: 866e9b9e47573d8169e4c4263f47dc085fb584062fd4ba45593b454b1a1306f9

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