Malicious PDF — malware analysis report

Static analysis result for SHA-256 9354c5b86b5acb28…

MALICIOUS

PDF

103.6 KB Created: 2021-04-30 23:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b28934b63fb5221a2bc4eb3cb7b5c65 SHA-1: 9fc7f9c1b86e634f25874b8c5d9b64a512aa6521 SHA-256: 9354c5b86b5acb282c9ca2fea32cd00ee732a72acdc7872127bfcb67cfca5ccb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with one notable URL being https://bologen.ru/strik?utm_term=was+the+10+percent+plan+used. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=was+the+10+percent+plan+used PDF link annotation
    • https://fowemofuf.weebly.com/uploads/1/3/1/3/131379389/tefid.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/sewotobujerutef-rilivema-sekokedubiba.pdfIn PDF document text
    • https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/wagiril.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/self_driving_car_using_raspberry_pi.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/e17c0.pdfIn PDF document text
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/9899747.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/how_to_do_cool_dance_moves_step_by_step.pdfIn PDF document text
    • http://vekowen.getenjoyment.net/women_s_role_in_armed_conflict.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/agneepath_poem_download.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/52200103229.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/94621697594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_81348a97738f41ccbac92b7c67298413.pdf?index=trueIn PDF document text
    • http://velirixegu.rf.gd/diccionario_nahuatl_espaol_unam.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_776b5badbd3d4dd7aace2ba234d66195.pdf?index=trueIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/truth_table_in_logic.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_4525c2bc38eb4aaa8d29a30f39d09188.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_757eb8118c3d48bbb9943524781cd1b0.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_d1892cdf2979435eab9b8eff0f8f8cef.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_ec29a26925ed4c148723b1e225c08653.pdf?index=trueIn PDF document text
    • http://wokebusaxefani.epizy.com/41141949750.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_6a1d973b9d2845c8812f5da6a95c45d2.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_67eeb1c99ab24c3fb7f4794ca999bde3.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_8d9515ecf1734f158ad23a0604b402b3.pdf?index=trueIn 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_off0001557e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557E 5368 bytes
SHA-256: ed4a7524a2dc4d2d70debf66658fad99f5b7c3a6b0deda3bd4ceb93b42346b73
font_01_sfnt_off000167c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C7 12080 bytes
SHA-256: 210204a0a7238ec5cf72df78aacfb9332bcdc41d4c1134d3074978fff3d5fb94

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