Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d7fc6f9b516be2…

MALICIOUS

PDF

86.2 KB Created: 2021-05-28 22:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4ee3abcd5224c95d45d87f313b94e1ea SHA-1: 4686fba892a32ce058a5203cc54d3f70d7a73c01 SHA-256: f4d7fc6f9b516be2c6dc66b87aeaaa69d5608472df506d79a7040c211685a2ba
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the overall structure align with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+clean+really+muddy+boots PDF link annotation
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/masekiraf_rojuvanarub_kubomopifapupox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fe95f006a5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_60601bd068ce0.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/nedorabenagop.pdfIn PDF document text
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/gutigemunuzik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5ffbceaa5d301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6014d57d06604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_6055f6a74c178.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/93f38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401692/normal_5ffe4ca437d60.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/mewasabizowaxozeniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fea247cb88e4.pdfIn PDF document text
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/tejoto-sipodo-poluluneta.pdfIn PDF document text
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/8548128.pdfIn PDF document text
    • https://sasinulipig.weebly.com/uploads/1/3/7/5/137512958/935664e83.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/totasof-fufemokiriseb-wivutene-pobodomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_606d2f4dd170c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_6056cc1cc58bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1256fe10-de8f-4f69-a315-7c85ff018576/the_power_book_11_ghost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb86ba4-9eb6-496b-9b1b-83ba840a2ef4/mojakutofipefososam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e4858f-6416-4e25-9aac-28544d28bb9c/call_me_by_your_name_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63d9c99-5697-4135-acb8-2297f208c277/mabomifegajafatuzata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba47df4-018a-4a7c-80ba-1c0f5f95d8ce/marsupiu_omni_360_cool_air_mesh_oxford_blue_ergobaby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebc0397-fc78-4f07-bf8d-c9515f33f7c3/fegirotatukepadasasab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeffaf2-1639-4097-8548-800bcd666545/xugovuvedibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a563d25c-3a2e-460c-9820-ccdf1c6941c0/que_es_una_propuesta_didactica_en_infantil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 5216 bytes
SHA-256: cdceda5b5449ee3a2dea7e69b213343eb1f6a85d5aaa8e295732b7df99944665
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 10456 bytes
SHA-256: 9c10bf022e3f3958cf638858410481777e9a9dc4281dc83aded5451689b07ab4
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361