Malicious PDF — malware analysis report

Static analysis result for SHA-256 1466af1a379f3546…

MALICIOUS

PDF

135.3 KB Created: 2021-04-08 10:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 10c3a1a65f84517e668d7b195a6450ad SHA-1: b0eef90681c27708892e0508d67e9583fb264e7b SHA-256: 1466af1a379f35467d3ad168dd5b823cbb19edd7593bfe8e84307986c5c57875
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. It contains a large number of external links, suggesting it functions as a link farm. One of the primary IOCs is a URL pointing to a potentially malicious redirector, which likely serves to distribute further payloads or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=mental+concepts+or+templates+that+intuitively+guide+our+perceptions+and+interpretations+are+called PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456999/normal_60442ecf4d144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_60130b82029c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_602ecd3dae4cb.pdfIn PDF document text
    • https://naferukogewoza.weebly.com/uploads/1/3/1/4/131406713/sirolawubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_600d12d2bee01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401525/normal_5fedd0d3eebbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_603a54417e170.pdfIn PDF document text
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/xobijow-budopuv-duvimeleba.pdfIn PDF document text
    • https://jotozorofelafik.weebly.com/uploads/1/3/1/4/131405965/sasizamidajeneka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fe5f7fb6bc5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_605fe89bec651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5fe3bdc4803af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_606eaaf89caa5.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/nubuxabonizubixereruzoni.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/patapar-xakal-gibisuvowagom-zoferonodono.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/5d116d2428c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_935acc15f5a24f0381b12414c4c67846.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/change_bitmap_pixel_format_c.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/55487509290.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_54a9174e9c9647359ff64201c0156dea.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_712daf92759f484494687ca6a44dcf2f.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_91b2c505891849e39578a6b91ccc6a59.pdf?index=trueIn PDF document text
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_097b6039ca304288a7878950e5ea0cce.pdf?index=trueIn PDF document text
    • http://sekuwomexapa.myartsonline.com/javascript_new_blob_type.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/what_are_the_seven_elements_of_design_in_art.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/xorusujulisukugimanuka.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/vadekevofavidun.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_off0001d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1D4 5656 bytes
SHA-256: 046fd887f6d706b4492e4eea34c0f9c29fa39cb5e5554c367cc850a0d169ed73
font_01_sfnt_off0001e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4F9 12460 bytes
SHA-256: c262e777bdece9ba3abcbc4e87a1b69c4e448424e9179763f1e237aa25d3b4b4