Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b1a778a44b5ecc…

MALICIOUS

PDF

80.3 KB Created: 2021-04-21 00:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 06ef02f9b04e504dfe30e2b2ef6b3567 SHA-1: 335a26f410be08f6de243eb59cfcff11b32fce68 SHA-256: 59b1a778a44b5ecc30275d2583d5b31388fe105627dc09d3792971e116641489
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and potentially a trojan. The presence of external URIs and a link farm points towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=dama+dmbok+spanish+pdf PDF link annotation
    • https://cdn.sqhk.co/xawodoze/hhdGo2i/pajepoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/igwhgie/89062376510.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/cMp6jdu/56661544508.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/kezubupagerekoxuwed.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/xrQK4ha/best_stocks_to_buy_on_vestly.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/BXopjek/21864344888.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/jRohjOu/13861312846.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/esZ1xhe/lode_runner_classic_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jdb83Sz/tupiderudowekowumoma.pdfIn PDF document text
    • http://dajumike.iblogger.org/calendario_serie_2018_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusozizogotudim.epizy.com/robililixisobo.pdfIn PDF document text
    • http://guwajogijifode.rf.gd/do_comic_books_have_age_ratings.pdfIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_cc94dfa7022242c690efe23f603989f8.pdf?index=trueIn PDF document text
    • http://fesemuk.rf.gd/43491617687.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/aplikasi_battery_info_view.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/organic_chemistry_basics_worksheet.pdfIn PDF document text
    • http://togugufi.epizy.com/public_administration_syllabus_for_bpsc.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_46bf12548b074dc49a775f2c628ec95d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/the_expanse_alex.pdfIn PDF document text
    • http://wabifitas.epizy.com/9043357817.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/neoplasia_maligna_de_colon.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_5834b4e0ecfc4cf89038080f63ba986c.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_aa7ed1f721de4918a253faf425a76af9.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_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 5356 bytes
SHA-256: 0c45c0c0aa51428b98568de4979c057d8c17fb23dff4af0e18ec6e522734c519
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 12480 bytes
SHA-256: 3b7e733218ab0573a256b765357ab118b494d2f838983d63c2a278b1692e2d23