Malicious PDF — malware analysis report

Static analysis result for SHA-256 74599c96dfd8dcab…

MALICIOUS

PDF

84.1 KB Created: 2021-03-22 07:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c0b40528b544aa8f0125cf07ee9419b5 SHA-1: c8baed1a93c31bb57197a52bd940ebfa154ea63b SHA-256: 74599c96dfd8dcab72c8429ab1bfdfc522e7dce625f16eb9e0e10802e1dda654
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and link farms. The document contains numerous embedded URLs, with at least one pointing to known malicious infrastructure, suggesting an attempt to redirect users to phishing or malware sites. The presence of a link farm on disposable hosting further supports a malicious intent.

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
  • 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.
  • 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/123?utm_term=games+bike+up+mod+apk In PDF document text
    • http://axecheat6.xyz/private_download_apk_uptodownzvaf1.pdfIn PDF document text
    • http://rewita.fun/partitura_careless_whisper_saxo_altoj9bpv.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/dazedago.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/lazobafo_wegobuxezim_buwive.pdfIn PDF document text
    • https://fikuzafunowu.weebly.com/uploads/1/3/1/8/131857523/33d21a.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/93947993881.pdfIn PDF document text
    • http://triple-doska6.club/how_to_cancel_adobe_subscription_on_mac4i06u.pdfIn PDF document text
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/nanom_dekotilapidita_vozem.pdfIn PDF document text
    • https://guvorike.weebly.com/uploads/1/3/4/2/134266232/613043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_543034c4a6ce48ff8f43743bd30e13a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/78249710228.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_5289acd1ebb447bb8c9826d16a21a63e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8f1dd3-7056-4410-9e1a-e2248fc4aabc/pofajotav.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/baumatic_double_oven_user_manual.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_f6998fcd7475446e99e17ced2ea0597f.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_44b2b646432647d4925ac9351a406b84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7064fe-1343-4f27-867b-097ce720d505/lunegorut.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_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 5212 bytes
SHA-256: cb65a67cfd565e28870b28c73764f6f1f0f438086c6e8bb9f1b8c6ed4f841cae
font_01_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 10908 bytes
SHA-256: ff580c9f2b0d549d1e99f58f27e4944c2c5a52649f41f69bab3d0e5260279290