Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc46eac3fe2aeb71…

MALICIOUS

PDF

81.7 KB Created: 2021-04-30 14:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 95bb4c88e91407affe2430ecbddff087 SHA-1: c3070ad0331d39c81203ded15936417a494516eb SHA-256: bc46eac3fe2aeb71a567dae24e68edc5d1ca291764a16caa994b94007231de5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is likely part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, suggests a lure related to 'how to fix a sink sprayer hose', indicating a social engineering pretext. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=how+to+fix+a+sink+sprayer+hose PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fccbb0b9df0a.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/10880102673.pdfIn PDF document text
    • http://italonewsero.site/yo_sin_tu_amor_grupo_limite_mp3xyqlm.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/jiTcD3A/movistar_colombia_telefonos.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/what_is_the_role_of_indigenous_knowledge_in_the_indigenous_science.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/oAeCloS/35518224287.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/jupad.pdfIn PDF document text
    • http://medyahanem.com/889960822225bcy8.pdfIn PDF document text
    • http://vittorguxx.site/speaking_activities_for_middle_school_studentsn2goj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_601f85fcf12ab.pdfIn PDF document text
    • http://moneyindia.site/abc_handwriting_worksheets_for_kindergartenhng0q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_6007e844598f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_603f62e067963.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/pjfxihK/celebrity_cruises_emergency_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6028b7dbd6665.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/73994218805.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/gifIN7N/betopatipowesemif.pdfIn PDF document text
    • http://degazizovudilod.22web.org/rekusewofas.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ihaliho/rarawowedojekuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/guided_city_tour_of_singapore.pdfIn PDF document text
    • http://dujofaxuro.rf.gd/34681571351.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/60103717699.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/capitalism_a_love_story_movie.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_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 5244 bytes
SHA-256: b5c5616ec4914231770db18c9a6911075c10776919a52d1b432f8cafa3252ed0
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 11692 bytes
SHA-256: f765bc26c35ca96f105932a2c6835fd78343284ba4478833714dddcf62cc6bc6

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