Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a861dafac2d5ac…

MALICIOUS

PDF

77.0 KB Created: 2021-04-23 20:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e33a41a247e8ad0c49546cb88e58aa2b SHA-1: d66c4bf86112ae2170c03c0e7e99407960299ee6 SHA-256: 81a861dafac2d5ac9047dc6b8d6f7dd2042dab0540c0ed81bd3aea51e482a267
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://soxebez.ru/strik?utm_term=badger+5+numbers
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/24396cc8cf248.pdf
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/jozirolixazebazona.pdf
    • https://xuwirebusupedun.weebly.com/uploads/1/3/4/3/134379604/6948647.pdf
    • https://cdn.sqhk.co/wibezudak/2ihgeja/u_mobile_centre_shah_alam_seksyen_7.pdf
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/zowazeto_sekiluwelujad.pdf
    • https://cdn.sqhk.co/marixefe/hfJyKja/hearts_of_palm_noodles_whole_foods.pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_604fb92843df4.pdf
    • https://xewikoleruwi.weebly.com/uploads/1/3/4/8/134897031/lamovelowa_zedogifavoxiti_lexubi_wugosivezezuwa.pdf
    • https://cdn-cms.f-static.net/uploads/4421200/normal_60694bc7bea29.pdf
    • https://cdn.sqhk.co/nedevupoj/gejfhdq/chehalis_river_report.pdf
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/devikon-viduzuga-sukibosi-bunemonoluroxax.pdf
    • https://cdn.sqhk.co/zukasedu/eheCggk/2020_super_snake_truck_specs.pdf
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fc641001c881.pdf
    • https://lajidusok.weebly.com/uploads/1/3/1/0/131070852/kekovedusevip.pdf
    • https://cdn-cms.f-static.net/uploads/4477626/normal_602e9a7d19865.pdf
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6045d4b559064.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_2f31b1017e4a4c81bcba7281629a82fe.pdf?index=true
    • https://s3.amazonaws.com/navoburarovada/cisco_catalyst_2960-_8tc-_l_manual.pdf
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_86f6b4f8ba3141db8063c9dfd5068539.pdf?index=true
    • https://s3.amazonaws.com/nazekisigiduz/brand_guideline_l_g.pdf
    • https://s3.amazonaws.com/wenobagupexekap/death_note_movie_light.pdf
    • https://s3.amazonaws.com/timituvupame/gy-_neo6mv2_apm2._5_datasheet.pdf
    • https://s3.amazonaws.com/piwanisaj/descargar_libro_11_minutos_de_paulo_coelho_gratis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1d.bin
e899a0c1be84b19a6aa0d5b0ce2f99ae13e397d8e0e368ef9562c0c1701a4a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 5428 bytes
font_01_sfnt_off0000fe7c.bin
db617a1713303982a22a3cb39affe3a9a8d4cb967a6fecd01bf2fc460fb1c3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 12068 bytes

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