Malicious PDF — malware analysis report

Static analysis result for SHA-256 0870d650779f9d01…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 04:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 84b731e1eab6b4e14dbe4df8c0326d06 SHA-1: 25c2f4e458523ba072ce8646c9c2461b8c0a1044 SHA-256: 0870d650779f9d014d215a89c19de2e551f0ad66a26c92e1738e6046d334dd84
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=casio+twin+sensor+watch PDF link annotation
    • http://wivuperafuzo.mypressonline.com/rizuvuvoz.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobigawe/ifFigjG/46098951483.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/how_to_hold_and_swing_a_baseball_bat.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/df1a2081.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/ets_gre_verbal_reasoning_practice_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/wolowivem/cCjjCje/vurinaxepoxuxiw.pdfIn PDF document text
    • https://xekotoruwogobib.weebly.com/uploads/1/3/1/6/131606212/2557572.pdfIn PDF document text
    • https://zapadakutomar.weebly.com/uploads/1/3/2/6/132680787/xugunifinidu.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/24929141201.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/91849930991.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/vuwelupozebe.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/wogidurobipujinuxujexopub.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/raridat.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/965527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofarasaxorepow.rf.gd/sesixuw.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/gogroove_flexsmart_x2_bluetooth_fm_transmitter.pdfIn PDF document text
    • http://refewebol.epizy.com/vojumupugupar.pdfIn PDF document text
    • http://firixafuzive.rf.gd/tupovadaruxatojat.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/prominent_chlorine_analyser_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/81956192267.pdfIn PDF document text
    • http://savipifuza.rf.gd/7803347901.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/36493645847.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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 4852 bytes
SHA-256: d20b4868cd851b7af30723564d181b7c8af81670e3e4e02d0b9f1d22037c460c
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10736 bytes
SHA-256: 056abb25b2161768c85ab3dd002a7ede53c907408eda465a9deba72e49c5a176

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