Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b86fc947cf2025a…

MALICIOUS

PDF

72.8 KB Created: 2021-04-08 20:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d92efd724a724a12b33c77d7fa38aac2 SHA-1: 0577fd4f00b5edced3d2935bdf827603ae5c5b86 SHA-256: 7b86fc947cf2025a4a4d8d1c7b356c1296d5c022f5615310d6787510f88815ae
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/strik?utm_term=geometry+polygons+worksheet+answers+pdf PDF link annotation
    • http://jidudilubad.mygamesonline.org/ibps_so_2020_notification_download.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/7442940.pdfIn PDF document text
    • http://dezoxovozabeluf.iblogger.org/gidovupivirajonixe.pdfIn PDF document text
    • https://zuwositoxo.weebly.com/uploads/1/3/5/3/135315809/wurofun_gibutimarek_polamoz.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/naxidifomel.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/9533914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_605b6609a9e13.pdfIn PDF document text
    • http://degimogug.mypressonline.com/office_assistant_duties_and_responsibilities.pdfIn PDF document text
    • http://xevokegejir.iblogger.org/wininuvulixurudobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5fea11a06d0c5.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/25f6e938-0a3f-4819-834d-f7557c29998f/18387063046.pdfIn PDF document text
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_e62c525561d5472c8b7d953464629e2b.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/63829466742.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_d195af83f60b41c680954df0b5964844.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae974482-26b6-4c3f-af58-1c938002c49b/10372473860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a08fa38-b757-4ffd-b592-31fb71988404/62939756078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa771a6b-31f3-46e8-b0d7-d6ab1db79bb0/kaxov.pdfIn PDF document text
    • http://pulepuvasa.rf.gd/duvevumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af55753b-34dc-4ca0-b3d8-4e3c3b24143a/memonu.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_03bd64c61f56402b817f30febe70e020.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_9502b6d9c454485899b3711d2cbb03e0.pdf?index=trueIn PDF document text
    • http://vaxalisuj.rf.gd/how_to_draw_a_dog_head_cute.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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 1776 bytes
SHA-256: f0389803bf6c8a48198512d1ae3466abb636f3328124a567a797d3f6a675e246
font_01_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5744 bytes
SHA-256: d49e0da0c9e76f5c7dfc364587640e512fbe97d78d854c388332d3895bff215b
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10736 bytes
SHA-256: e5cc721ceab026bcbd65f4b5b2f0b87cab6a6d785e61baf69a8d6daef3c01f0f