Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4bcc666c2fe31…

MALICIOUS

PDF

77.7 KB Created: 2021-06-03 00:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fe54cdb26a53f87b65c62ca87fe53665 SHA-1: 059960ac4762ccc080f7c021afaadd45cf536078 SHA-256: 2db4bcc666c2fe311426afad4df74c44ae504e39439051c4ae8406a22b97c3e5
186 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 file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=printable+possessive+nouns+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481406/normal_605fa85d2a5fa.pdfIn PDF document text
    • https://sumolepixa.weebly.com/uploads/1/3/4/6/134635742/sapegexij-gegibal-zasadojipokukim-ziguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_6064d50a53df4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_60086bd4861fb.pdfIn PDF document text
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/b159bb389a2.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/puzaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_6037503dc2d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_602fe05fd4b8b.pdfIn PDF document text
    • https://namulore.weebly.com/uploads/1/3/4/0/134017746/vosarari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_60468c96a80cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374537/normal_5fe222ced825e.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/nupupufeziminarafak.pdfIn PDF document text
    • https://vunufagedumuved.weebly.com/uploads/1/3/4/7/134740761/447567.pdfIn PDF document text
    • https://takazomidiki.weebly.com/uploads/1/3/4/4/134470224/2965022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fd99942a7b49.pdfIn PDF document text
    • https://pofunaresexex.weebly.com/uploads/1/3/4/7/134717420/tojijuvunonugexu.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/3dd51540-7dfa-418b-aa8e-0e24976cdcf7/resumen_de_la_fuerza_de_sheccid_capitulo_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f027155a-3f0b-4007-8bbe-4ec2d612964b/xozekupapikilunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32935a32-b6a0-4a11-b2ae-ed4bc936eeee/tecnicas_para_la_recoleccion_de_datos_en_una_investigacion_cuantitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b58ead2-0ac3-4af1-8173-1413615dfce8/zavumelunutalisuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6927cf-6174-44c0-bef3-a29e9c02911c/western_digital_tv_live_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a043ff-6a55-4d5a-b996-4476bbbaff43/what_is_the_difference_between_pool_and_snooker_cues.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_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5264 bytes
SHA-256: 9e304ebd7cde9e8bbc59b2eb521eb5632b1e4805cfd0575d6aea691fe6b2da6c
font_01_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 10548 bytes
SHA-256: b26d2ab7623d5cc73183b64cb929f52e9927e9e29a803f1711c41601dea58a57