Malicious PDF — malware analysis report

Static analysis result for SHA-256 536bcebbdf5247cb…

MALICIOUS

PDF

74.8 KB Created: 2021-05-28 03:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3590763f4e6a43eed8f5b7ac74aeec33 SHA-1: a43ae32c944567fb18b06fe346fb1b3af0965452 SHA-256: 536bcebbdf5247cb450e6095676e840af1db1ad706a3ab332098bd44bbb2bc20
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The primary malicious URL identified is jumiwimov.ru, which is likely used to host or redirect to a malicious payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=the+master+guide+to+drawing+anime+free+pdf
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/4560153.pdf
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/56a7a6dbe.pdf
    • https://mipabewezodif.weebly.com/uploads/1/3/5/3/135315693/38dc01d529.pdf
    • https://cdn-cms.f-static.net/uploads/4465018/normal_605d6963b441d.pdf
    • https://static.s123-cdn-static.com/uploads/4488116/normal_6004cbb63a4dc.pdf
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fe4c97530c84.pdf
    • https://cdn-cms.f-static.net/uploads/4417403/normal_5fdc4e80ed657.pdf
    • https://cdn-cms.f-static.net/uploads/4401985/normal_600d82b5868cf.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_605dad6201024.pdf
    • https://pogedefulelot.weebly.com/uploads/1/3/4/6/134628496/zuvizidoxatu_jogunase_wepowagatum_sexiliwudu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/14dc123f-800d-4b3f-885f-094dc818d35b/21580417884.pdf
    • https://uploads.strikinglycdn.com/files/de258899-6f9d-4a97-998b-e3d2862a6b3b/5777879589.pdf
    • https://uploads.strikinglycdn.com/files/d4a8fc81-32b9-439b-baf1-a5946fced56e/13797131899.pdf
    • https://uploads.strikinglycdn.com/files/2f68ae35-edaa-4506-9b39-091783055838/requisitos_renovar_licencia_de_conducir_puerto_rico.pdf
    • https://uploads.strikinglycdn.com/files/a9ff3f2a-a0ff-4b32-9fb6-321f3f5c8bb9/mxr_bass_compressor_pedal.pdf
    • https://uploads.strikinglycdn.com/files/882154cc-2509-48c3-aa0a-e59b44362426/emergency_medicine_jobs_hawaii.pdf
    • https://uploads.strikinglycdn.com/files/a8e65a75-3ab7-4e50-8ab6-3809fa6ae80f/chamberlain_liftmaster_elite_series_logic_3.0_remote_programming.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82e.bin
85d45586fcfcd7db1bec4e84552c1ef7fa0383b4856e6bc80e5727afcff7f4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 5344 bytes
font_01_sfnt_off0000ea45.bin
1ba82ea17c10572e04bce64f221a8023af3477dd868068881ac2ac042bb8d83e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 11072 bytes
font_02_sfnt_off00011016.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 4324 bytes