Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03ed2734e6e3248…

MALICIOUS

PDF

92.7 KB Created: 2021-03-17 03:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d2217ef3b3a39aa4891c59d4eb34c86 SHA-1: d1775f592dabc9387186ec4e0ccc75d4ff552253 SHA-256: d03ed2734e6e32485441245337842792b654011dff0fca94bb21d08d43747c29
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/123?utm_term=bunraku+performance+osaka PDF link annotation
    • https://xijadetula.weebly.com/uploads/1/3/5/2/135296157/5075523.pdfIn PDF document text
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/wikuwesovegubogow.pdfIn PDF document text
    • http://ximilakuxulo.iblogger.org/francis_chan_books.pdfIn PDF document text
    • http://lofobidu.22web.org/how_to_remove_thermostat_from_vivint_panel.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/sifipo.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/notolafugejux.pdfIn PDF document text
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/9804563.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/wizego.pdfIn PDF document text
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/5474981.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/gamosabemodewu.pdfIn PDF document text
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/tojirimefi.pdfIn PDF document text
    • https://zudopawugaweso.weebly.com/uploads/1/3/4/3/134343229/717fc402c00b.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/f0abda4a-60e9-4898-8dbd-eea47ef74e55/mini_dvi_to_usb_c_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5542cafb-78ef-4171-9737-e28eac961407/65036993242.pdfIn PDF document text
    • http://pidawuz.epizy.com/christmas_song_dubstep_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/90518886849.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_cc726883a22c4e6db8d510a6199760ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e7bad1-1812-4365-893e-2d4dfc74d1a9/do_clarice_and_hannibal_fall_in_love.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/busqueda_por_voz_chrome_android.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_31fa839c99804c21b1beaea74b865bcf.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_b4138d7d05b646b089aff52426a98bda.pdf?index=trueIn PDF document text
    • http://murunujerumax.rf.gd/asuran_box_office_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d3521f-16d1-43ef-9156-c8639ac502cf/63881652950.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_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 5244 bytes
SHA-256: 5c608f4e825b67226e17c1580935605ea3a5a41b2ee3ba932e39b6f69aa8124b
font_01_sfnt_off00014048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14048 10688 bytes
SHA-256: aea0d76e2c73158ea78f3ede32e097f9a8d337731aa7fdea9d65ba9539575039