Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f77da67a56012c…

MALICIOUS

PDF

75.6 KB Created: 2021-04-06 13:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c9713531ff040c5aa84d725c959bd71 SHA-1: 703c81eda2f882e16c0da8fe000eb94d6e1c5516 SHA-256: 52f77da67a56012c3142e757430bfed316d4a80f888eb76d473d163dcea98973
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://dafemum.ru/wix?keyword=manual+extension+cord+reel PDF link annotation
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/9315206.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/gLsfV6q/zuwobusa.pdfIn PDF document text
    • http://jezituwevusefaf.iblogger.org/tizulugutaseto.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/abb63d27b68.pdfIn PDF document text
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/nozabitexigexu-nabagamazowe.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/xelafuwosatafa.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/avolite_pearl_2020_manual.pdfIn PDF document text
    • http://organicnu.info/agatha_christies_poirot_season_11_episode_3wmqtg.pdfIn PDF document text
    • http://virutimi.22web.org/24601890382.pdfIn PDF document text
    • http://astropsychology.site/vemafifepinijoruzxut5d.pdfIn PDF document text
    • http://samyog.ru/agnus_dei_music_sheet1qr6b.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/biiidZk/cute_goblin_40k.pdfIn PDF document text
    • http://megantv.site/51827906950tewsa.pdfIn PDF document text
    • https://cdn.sqhk.co/ranilabar/iZBfjjf/51832684497.pdfIn PDF document text
    • http://bilkaita.space/granite_mountain_firefighters_autopsb2jxj.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/gexexilalevulomugibopi.pdfIn PDF document text
    • http://sandiego-podcasts.com/spanning_tree_protocol_tutorial_ppt7mb14.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/9e2ee405.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/fodiwujasivobi.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/85505504800hehsl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapukup.epizy.com/agricultural_water_management.pdfIn PDF document text
    • http://jusowegakero.epizy.com/24233224528.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/atwood_testaments.pdfIn PDF document text
    • http://megeloxukix.epizy.com/ketogenic_diet_plan_philippines.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/27150044364.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 5004 bytes
SHA-256: 7b269f2f149353184cfc73b6bd4a6d24254510fff1d1671c8f725231658585ec
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 10704 bytes
SHA-256: 79a4894caf42dde2cd742e7d813bd2f5c12dde9c34b648e16b27bcc08d3bc8f2
font_02_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16240 bytes
SHA-256: d9cb6d6eea7f90e0bea3ffc174bdefe6fec5e9b89f048f5df1c27dc4352c8f8f