Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6050dde090cfc6b…

MALICIOUS

PDF

69.1 KB Created: 2021-02-28 09:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6bb9e22268e49e038e1144f7ca24ea64 SHA-1: 4da6866babb8335aca68a62fa6494990e983f5d7 SHA-256: a6050dde090cfc6bf9362137b9058c26f028c85f5b82983867996954d1ff5068
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to various websites, some of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to puppy sales, directing users to potentially harmful external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=teacup+chihuahua+puppies+for+sale+in+ky PDF link annotation
    • http://copyrightshelpcenter.com/skyrock_radio_direct_frequence_montpellieros1w6.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/dgdhgid/tamil_love_whatsapp_status_video_download_wapwon.pdfIn PDF document text
    • http://raderojazoz.iblogger.org/collinear_and_coplanar_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5ff9be9b65007.pdfIn PDF document text
    • http://naturebiolog.space/473599647460rn5w.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/rjddkSa/jamaica_radio_mello_fm.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/fhh1hcR/ritudomivutudugudagiri.pdfIn PDF document text
    • http://itasda.online/kenmore_elite_washer_model_11013jy8.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/idSzdeX/try_not_to_laugh_challenge_markiplier_15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384482/normal_5fe5a382e63b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_6021974068403.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/how_do_i_download_a_student_version_of_autocad.pdfIn PDF document text
    • http://numulul.mygamesonline.org/why_is_the_fridge_leaking_water_inside_it.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5ff7682ad715b.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/haZTDS0/nejadekelipox.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/idTfxGU/kosojadapa.pdfIn PDF document text
    • http://edayafar.xyz/parliamentary_procedure_book79fn5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejovafejasujob.rf.gd/tupamebolek.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/how_to_find_z_score_on_ti_84_plus_ce.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/30137645562.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 5220 bytes
SHA-256: b0416f01585a1a89bfb08f30022fd36851b3bafd3dd6fe329d78b94368ceb7e4
font_01_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10152 bytes
SHA-256: 555d8555129f6ed1ca957edb1db8fd2f3f57264940aec1480512e24c969e3501

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