Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e2ec9437e38a2d…

MALICIOUS

PDF

73.5 KB Created: 2021-04-06 17:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc5778474a170bc5dc77f1d7664e33c9 SHA-1: e457f2a50f87c912bd85482404020d7e6cb91255 SHA-256: b1e2ec9437e38a2d23e26dc6d0ba5586e8f9d09dc7a9f84d246bbb0004664f27
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing lure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'SE_PASSWORD_ARCHIVE_LURE' heuristics. It contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=recover+password+google+play In PDF document text
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/de11edc91d47.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/o3YRbkU/rifepaxekebijir.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/dozaniwoliropax.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/ezn8Xdl/cheapest_flights_to_san_francisco_from_london.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/NhccjgM/nutaturevadekojatutino.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/ZhenDib/32338203182.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/rabofurinazoruvigop.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/dQJhgRI/25304135894.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/600099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_60059b65ee3cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fffc46e9cb3d.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/jzhaIic/38687051801.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/nqwjhhr/motorcycle_helmets_for_sale_on_ebay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_27d5fd12423f436293947c8575616ed5.pdf?index=trueIn PDF document text
    • http://ritipoma.epizy.com/21070840715.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_6e5151799a234f95a7ee2d0f103faeaf.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_e13a6051d04641d7bec7510628087632.pdf?index=trueIn PDF document text
    • http://talusulimatedo.rf.gd/autodesk_3ds_max_trial_version_free.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_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 5500 bytes
SHA-256: b39664e51eae18703cee734a40f441b4e0bacab58f623919ed87ff76fc18f7bb
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 10792 bytes
SHA-256: fd0ca7882d3f8b20c8376a3ce17676736ed140754b978fc020e2cc926b5a8c22