Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a92a7d0c8b72603…

MALICIOUS

PDF

73.2 KB Created: 2021-02-25 12:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3f7a8d59440bdd157667c7f63900abe7 SHA-1: 9ec936c0c7b27357edbfd0d2d795db135cebeaf2 SHA-256: 1a92a7d0c8b7260350355b6666b4518deb7ff1b688120953a8cda68efed3a8bc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/award?keyword=what+does+lowes+charge+to+install+laminate+flooring In PDF document text
    • http://sununetapa.22web.org/new_moon_cafe_nevada_city.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/aspiracion_de_secreciones_bronquiales_procedimiento.pdfIn PDF document text
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/pewinokimowevonaxip.pdfIn PDF document text
    • https://pidesetax.weebly.com/uploads/1/3/0/7/130739971/b1a7ec0e9c6a8.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/hbhjgfz/levuvixidagilaremewe.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/8632665.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/ii5Kcig/original_singer_of_love_letters_in_the_sand.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/tOgdgd7/ocoee_river_cabins_for_rent.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/987dfdc66.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/xisesumuj.pdfIn PDF document text
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/1562286.pdfIn PDF document text
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/9623177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://simifibu.epizy.com/27634826747.pdfIn PDF document text
    • http://wijogural.epizy.com/basic_actuarial_mathematics.pdfIn PDF document text
    • http://mabiwariw.epizy.com/poulan_pro_5020_chain_file_size.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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 5540 bytes
SHA-256: 94ade62ee3af87abbcada8b93ff23555f7b07a8d3d1497a1e4adb584186f53ea
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10084 bytes
SHA-256: 079e0aea497116d2e4a0def92ea60361202acf12fd96c97ea1a5e04abeea2ba8

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